Men Have a Biological Clock Too. It Just Works Differently.
Male fertility doesn't suddenly disappear at 35 or 40—but age still matters.
Men keep producing sperm throughout life, so it is easy to assume age doesn't matter. It does — just more gradually than it does for women.
What changes with age
- Semen volume and sperm motility may gradually decline.
- Sperm DNA fragmentation, damage to the genetic material inside sperm, tends to increase.
- Time to conception may lengthen for some couples.
- Research associates advanced paternal age with modest increases in certain pregnancy and child health risks.
There is no single age when male fertility ends. Changes are gradual and vary widely between men.
Age isn't the only factor
Health conditions, medications, weight, smoking, and heat exposure can influence fertility at any age, and often accumulate over time. Some of these are within your control.
When preservation may be worth discussing
Sperm freezing may be worth discussing if you plan to delay having children, are starting a treatment that could affect fertility (such as testosterone therapy or cancer treatment), or work in a higher-risk occupation. A clinician can help you weigh whether it makes sense for you.
Educational content only. This article is not medical advice and does not replace evaluation by a qualified healthcare professional.