Women go through menopause at around the age of 50. During menopause, the final eggs are released and women move into the latter stages of life when reproduction is no longer possible. Women are born with a set amount of eggs and when those eggs are depleted, there are no more eggs to mature. Men, on the other hand, produce sperm for life, unless there is a medical condition or treatment that has rendered him sterile. At no point in life does the man run out of sperm, though sperm production may slow and the quality of sperm produced may be comprised later in life.
Male Versus Female Fertility
When we look at human genetics, we have to look at the past millennia – not just the past few decades. Women have been the primary care givers for children for thousands of years. Women produced milk, so infants and children could feed even when food was scarce. They were responsible for gathering and farming, in many cultures, so food production and cooking was also taken care of by women. If the male were to die in battle or while hunting, other men in the tribe would provide for the needs of the woman and her children, but she would inevitably be the one to raise the children to adulthood.
If you look at history from this standpoint – women needed to stop producing children early enough to finish raising her last children before death. Life span was greatly reduced more than a thousand years ago, so women often stopped having children in their 40s, naturally as there was no reliable birth control. That left more than enough time, in most cases, to raise children and move into the wisdom portion of life.
So, men do not lose their ability to reproduce for life, but genetics is catching up. Today, more men are suffering andropause than ever before. Andropause is a form of male menopause. Some believe that men will eventually lose the ability to reproduce later in life as reproduction needs diminish.