Because of the information we read in the media, we think that the biological clock is something that only women have. But it seems that this is a mistake. Apparently, for the both sexes become harder to have children over the years and is very likely that children will have complications during childbirth if the parents are older. The biggest difference is that male fertility decreases 5 years later than women. 

The term biological clock is most frequently related to women, mainly for fertility and pregnancy. However, men with age significantly decrease the ability to realize as fathers, and upon crossing their 30th. In fact, research shows that often leads to abortion of the fetus if the father is older, due to poor quality sperm, although until recently almost all the blame for it attributed to the woman and her age.

This information is from a study done in 2007 in France that involved about 2,000 pairs. Another study found that men who are over 35 years old are twice as likely to infertility than men who are 25 years or younger. Sperm quality decreases with age, therefore, increasing the risk of miscarriage and chances of the child to have health problems, such as autism.

Where does the connection of the biological clock in women come?

This misunderstanding stems from the fact that male fertility began to investigate only recently. Women have different periods of reproduction, and they have a clear beginning and end. We know that men produce sperm from puberty until the end of life, and until recently was unknown whether the sperm is also effective during the whole life.

While women are born with a limited number of eggs, men produce sperm throughout life, with the existing sperm replicated its DNA and then divide into two, over and over. This may seem like a fountain of youth for men, but actually more like a game of “Broken Telephone.” Each time the process is repeated, there is a chance that the DNA will at least change.

Source: http://www.kafepauza.mk/zanimlivosti/mitot-za-bioloshkiot-chasovnik-na-zhenite/