Your Sperm Have Birthdays Too: The Truth About Male Fertility After 30

Picture this. A couple has been trying for a baby for two, maybe three years. She has done the scans, the hormone tests, the fertility teas, the prayer and fasting, and the long talks with her mother-in-law that end in silence. He has done… nothing, really. Nobody asked him to. After all, he is “fine”.

I have had this conversation more times than I can count, and I want to say something plainly: it takes two people to make a baby, and very often it takes two people to struggle to make one.

Across the world, about 1 in 6 adults will face infertility at some point in their lives.¹ And when doctors investigate couples who cannot conceive, a problem on the man’s side plays a part in roughly half of them.² Half. Yet in many of our homes, the woman still carries the whole weight.

So, gentlemen, this one is for you. Especially if you have crossed 30.

Yes, men have a biological clock too

Men don’t have a menopause. There is no dramatic switch-off, and plenty of men father children in their 50s and 60s. That fact has fed a dangerous myth: that male fertility is forever.

It isn’t. The male clock ticks quietly, not loudly. From your 30s onward, small changes start to pile up:

• Your swimmers slow down. A large review of 90 studies, covering almost 94,000 men, found that semen volume, the share of sperm that move well, the share with a normal shape, and the share with intact DNA all fall steadily with age.³
• It takes longer to get pregnant. In one UK study, men over 45 took about five times longer to get their partners pregnant than men under 25, even when the women were young.⁴
• Miscarriage risk creeps up. Compared with fathers aged 25–29, the risk of miscarriage was about 23% higher when the father was 40–44 and about 43% higher when he was 45 or older.⁵
• More “spelling mistakes” get passed on. Every extra year of a father’s age adds about two new genetic changes to his child’s DNA. For any one child the risk stays small, but it is real.⁶

None of this means you should panic at 31. It means the old line, “time is only a woman’s problem”, needs to retire.

And it isn’t only age

Sperm counts have been falling for decades, and the fall is speeding up. A major 2023 analysis found that average sperm concentration dropped by more than half between 1973 and 2018. For the first time, the decline was confirmed in Africa, Asia and South America as well, not just in Europe and America.⁷

Closer to home, researchers looked at the semen results of over 17,000 men tested at fertility clinics in Lagos, Abuja, Johannesburg and Pretoria. Between 2010 and 2019, the share of sperm swimming forward properly fell sharply in the Nigerian group, to well below the World Health Organization’s normal range.⁸ These were men already attending clinics, so they don’t represent every Nigerian man. Still, it’s a warning light we should not ignore.

The blame game: why we keep looking at the wrong person

Let’s be honest about our culture. When a marriage has no child, the questions go to the woman. Her womb is “closed”. She is “eating the babies”. A family meeting is called. Sometimes a second wife is suggested. Meanwhile, the man is often the last person to be tested, and sometimes he flatly refuses.

Why? Because many of us have tied fertility to manhood. If a man’s sperm is weak, we feel his manhood is weak. So the test feels like an insult, and it gets avoided.

Let me clear up a few things I hear all the time:

Here’s the good news. The male test is the simplest part of any fertility check. Guidelines from American urology and fertility specialists advise that both partners should be checked at the same time, right from the start.² One sample, one lab, and you have answers that could save your family years of heartache.

Everyday habits that quietly sabotage your swimmers

Sperm take about two and a half to three months to be made. That means the way you live today shows up in your semen in three months’ time. The good news? It works in reverse too.

That growing belly

Carrying extra weight, especially around the waist, is linked to lower sperm counts and a higher chance of having no sperm in the semen at all.⁹ Belly fat also turns some of your testosterone into oestrogen, which is not the hormone balance you want. Trimming that belly is one of the kindest things you can do for your hormones.

Cigarettes and shisha

Smoking lowers sperm count, movement and shape, and heavier smokers fare worse.¹⁰ Shisha is not a “lighter” option either: an hour-long session can mean breathing in far more smoke than a single cigarette.

Weekend owambe drinking

A bottle at a party won’t ruin you. Regular heavy drinking is another story: it lowers testosterone and harms sperm production. If you are trying for a baby, cut back hard.

Heat, heat and more heat

Your testicles hang outside your body for a reason. They like to be a couple of degrees cooler than the rest of you. Tight briefs, a hot laptop on your lap, long hours in a hot car or a hot bath can all work against you. In a study of 656 men, those who mostly wore boxer shorts had 25% higher sperm concentration than men who wore tighter underwear.¹¹

The phone in your front pocket

A large Swiss study of almost 2,900 young men found that those who used their phones more than 20 times a day were more likely to have a low sperm concentration.¹² This kind of study shows a link, not proof. But moving your phone from your front pocket to your bag costs you nothing.

“Power” drugs and gym juice

This one is serious, and it’s common. Testosterone injections, anabolic steroids and some unregulated “manpower” mixtures can switch off sperm production completely. The extra testosterone tells your brain to stop sending the signal your testicles need to make sperm. That’s why fertility specialists advise that men trying to conceive should not use testosterone.² Recovery can take months, so if you are using any of these, speak to a professional before you stop or start anything.

Tramadol, codeine and igbo

Opioid painkillers like tramadol and codeine syrup, when misused, can lower testosterone and dampen sex drive. Cannabis has also been linked with poorer semen. If you are struggling to stop, we will help you find support. No judgement.

Stress, poor sleep and the air we breathe

Long-term stress and short nights mess with your hormones. Researchers studying Nigerian men have raised concerns about pesticides and crude-oil pollution as possible contributors to poor sperm quality,⁸ and here in the Niger Delta, that one hits close to home. You can’t control everything, but you can control your sleep, your diet and your exposure at work, for example by wearing protective gear when handling chemicals.

The health conditions that crash the party

Sometimes the problem isn’t a habit. It’s an illness that has been quietly working in the background.

• Diabetes and high blood pressure. Both damage blood vessels and nerves. That can affect erections, ejaculation and sperm quality. Please don’t stop your medicines on your own. If you think a medicine is affecting your fertility, talk to us or your doctor. There is often a suitable alternative.
• Varicocele. Swollen veins in the scrotum, sometimes described as feeling like a “bag of worms”. They warm the testicles and are found in about 15 in every 100 men, and in roughly a third of men seen for infertility.¹³ The good news: they can be treated.
• Old or hidden infections. Gonorrhoea and chlamydia often cause no symptoms in men. Left untreated, they can scar and block the tubes that carry sperm. Mumps after puberty can also damage the testicles.
• Sickle cell disease. Both the condition and some of its treatments can affect sperm. If you have sickle cell, plan pregnancy with your doctor early, before starting new treatments where possible.
• Hormone and thyroid problems. Low testosterone, a high prolactin level or an under- or overactive thyroid can all play a part, and a simple blood test can pick them up.

Here’s something many men don’t know: poor semen quality can be an early warning sign about your general health. In one US study, men with two or more semen abnormalities had more than twice the risk of dying over the following years compared with men with normal results.¹⁴ So a semen test isn’t only about babies. It’s a health check.

Supplements: what’s worth your money, and what isn’t

I work in a pharmacy that sells supplements, so let me be extra honest with you. No capsule can open a blocked tube, fix a varicocele or replace a doctor. But for men whose sperm move slowly, have poor shape or are under “oxidative stress” (think of it as rust caused by smoking, pollution, illness and age), a few supplements have reasonable evidence for improving the numbers.¹⁵

Two things to keep in mind. First, better semen numbers don’t always mean more babies. Large reviews show that antioxidants may raise pregnancy and birth rates, but the evidence is still weak.¹⁶ Second, give anything you try at least three months, because that’s how long a new batch of sperm takes to mature.

What to avoid: unlabelled “manpower” roots, herbal mixtures with no ingredient list, and anything sold as a “testosterone booster” that might contain hidden hormones or drugs. If a product promises to fix everything in a week, walk away.

Check before you combine. If you take blood thinners, blood pressure tablets, diabetes medicines or anything else regularly, ask a pharmacist before adding supplements. Some combinations need care.

Your 90-day fertility reset

If you are over 30 and planning a family, here’s a simple plan you can start this week:

1. Get a semen analysis. Abstain from sex for 2–7 days before the test, and repeat it if the first result is abnormal, since one sample can vary.
2. Know your numbers. Check your weight, waist, blood pressure and blood sugar, and ask about an STI screen.
3. Trim the belly. Walk daily, cut sugary drinks, and eat more vegetables, beans, fish and fruit.
4. Quit smoking and shisha, and cut back on alcohol.
5. Keep it cool. Wear looser underwear, keep the laptop off your lap and the phone out of your front pocket.
6. Say no to steroids and testosterone unless a fertility specialist is guiding you.
7. Sleep 7–8 hours. Your hormones do their best work at night.
8. Consider proven supplements for at least three months, after a quick check with a pharmacist.
9. Go together. Book appointments as a couple. You are a team.

A word to the wives (and the mothers-in-law)

If you have been carrying this alone, you are not the problem by default. Share this article. Ask him, kindly, to get checked. And to the aunties and mothers-in-law: before pointing at anyone, ask whether both of them have been tested.

To the men reading this: getting tested is not weakness. It is leadership. The bravest thing you can do for your family is to find out, early, and act on what you learn.

References

1. World Health Organization. 1 in 6 people globally affected by infertility (Infertility prevalence estimates, 1990–2021). WHO; 2023. View source
2. Schlegel PN, Sigman M, Collura B, et al. Diagnosis and treatment of infertility in men: AUA/ASRM guideline part I. Fertil Steril. 2021;115(1):54–61. View source
3. Johnson SL, Dunleavy J, Gemmell NJ, Nakagawa S. Consistent age-dependent declines in human semen quality: a systematic review and meta-analysis. Ageing Res Rev. 2015;19:22–33. View source
4. Hassan MAM, Killick SR. Effect of male age on fertility: evidence for the decline in male fertility with increasing age. Fertil Steril. 2003;79(Suppl 3):1520–1527. View source
5. du Fossé NA, van der Hoorn MLP, van Lith JMM, le Cessie S, Lashley EELO. Advanced paternal age is associated with an increased risk of spontaneous miscarriage: a systematic review and meta-analysis. Hum Reprod Update. 2020;26(5):650–669. View source
6. Kong A, Frigge ML, Masson G, et al. Rate of de novo mutations and the importance of father’s age to disease risk. Nature. 2012;488(7412):471–475. View source
7. Levine H, Jørgensen N, Martino-Andrade A, et al. Temporal trends in sperm count: a systematic review and meta-regression analysis of samples collected globally in the 20th and 21st centuries. Hum Reprod Update. 2023;29(2):157–176. View source
8. Akang EN, Opuwari CS, Enyioma-Alozie S, et al. Trends in semen parameters of infertile men in South Africa and Nigeria. Sci Rep. 2023;13:6819. View source
9. Sermondade N, Faure C, Fezeu L, et al. BMI in relation to sperm count: an updated systematic review and collaborative meta-analysis. Hum Reprod Update. 2013;19(3):221–231. View source
10. Sharma R, Harlev A, Agarwal A, Esteves SC. Cigarette smoking and semen quality: a new meta-analysis examining the effect of the 2010 World Health Organization laboratory methods for the examination of human semen. Eur Urol. 2016;70(4):635–645. View source
11. Mínguez-Alarcón L, Gaskins AJ, Chiu YH, et al. Type of underwear worn and markers of testicular function among men attending a fertility center. Hum Reprod. 2018;33(9):1749–1756. View source
12. Rahban R, Senn A, Nef S, Röösli M. Association between self-reported mobile phone use and the semen quality of young men. Fertil Steril. 2023;120(6):1181–1192. View source
13. European Association of Urology. EAU Guidelines on Sexual and Reproductive Health: Male Infertility (varicocele). EAU; current edition. View source
14. Eisenberg ML, Li S, Behr B, et al. Semen quality, infertility and mortality in the USA. Hum Reprod. 2014;29(7):1567–1574. View source
15. Salas-Huetos A, Rosique-Esteban N, Becerra-Tomás N, et al. The effect of nutrients and dietary supplements on sperm quality parameters: a systematic review and meta-analysis of randomized clinical trials. Adv Nutr. 2018;9(6):833–848. View source
16. de Ligny W, Smits RM, Mackenzie-Proctor R, et al. Antioxidants for male subfertility. Cochrane Database Syst Rev. 2022;5:CD007411. View source
17. Akhigbe TM, Fidelis FB, Adekunle AO, et al. Does coenzyme Q10 improve semen quality and circulating testosterone level? A systematic review and meta-analysis of randomized controlled trials. Front Pharmacol. 2025;15:1497930. View source
18. Schisterman EF, Sjaarda LA, Clemons T, et al. Effect of folic acid and zinc supplementation in men on semen quality and live birth among couples undergoing infertility treatment: a randomized clinical trial. JAMA. 2020;323(1):35–48. View source