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Is there a biological clock in men as in women?

By Leonor Ortega López B.Sc., M.Sc. (embryologist).
Last Update: 02/12/2024

The notion of a "biological clock" is a concept that has traditionally been associated primarily with women in the context of fertility, but it is important to note that men also experience changes in their fertility over time. Although these changes are not as marked as in women, there is variability in sperm quality and quantity as men age.

For women, the biological clock is directly related to the decline in ovarian reserve and egg quality with age. Women have a limited fertility window, which usually decreases significantly after the age of 35. In men, sperm production is continuous throughout life, they do not have a "reserve," but as they age, sperm quality may deteriorate, which could affect fertility.

Studies have shown that older men may experience a decrease in sperm motility and morphology, which could influence the ability to conceive. In addition, advanced paternal age has been linked to an increased risk of certain health conditions in offspring, such as autism and schizophrenia.

Sperm quality is a relevant factor to consider, especially if parenthood is delayed. Therefore, it is important for both men and women to consider their biological clock. While the concept of a "biological clock" may not be as pronounced in men as in women, age is still an important factor in male fertility and the health of offspring.

 Leonor Ortega López
Leonor Ortega López
B.Sc., M.Sc.
Embryologist
Leonor Ortega López studied Biological Sciences at the University of Valencia (Spain). She then completed a Master's Degree in Human Reproduction taught by the Spanish Fertility Society and the Complutense University of Madrid.
License: 03123-CV
Embryologist. Leonor Ortega López studied Biological Sciences at the University of Valencia (Spain). She then completed a Master's Degree in Human Reproduction taught by the Spanish Fertility Society and the Complutense University of Madrid. License: 03123-CV.