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Age and fertility. What are they related?

For Women

A woman is born with all the eggs she will ever have (about 400,000). During their reproductive years, usually every month one egg matures. But over time, stocks of eggs are depleted and the remaining eggs become inactive.

Poor egg quality leads to poor embryo quality. That in turn severely affects the chances of a woman to conceive and come to term in her pregnancy.

It is estimated that women have a 25% chance of pregnancy per month on a sustained sexual relationship at the time of ovulation. After 35 years, the low probability of pregnancy by 10%, and after 40 years of age, the odds decrease to less than 5% per month.

The main risks of older women seeking pregnancy are:

  • Irregular ovulation and changes in the quality of the uterine lining to hormone levels fluctuate over time.
  • Longer to diseases such as endometriosis and uterine fibroids affecting the reproductive system exposure.
  • Increased risk of miscarriages (spontaneous abortions) and genetic abnormalities.

For Men

Age has less effect on male fertility. This is partly because the woman is born with all the eggs she will ever have, whereas sperm are constantly regenerating after puberty.

On the other hand, the sperm of older men often lose some of their potential fertilization. Sperm can lose motility and shape can change.

A healthy man in his 50s has a 80% chance of having abnormal sperm motility, 35% have a low level of semen, and 15% chance of having a low sperm count.

In addition, for some older men it is also accompanied by a decrease in testosterone levels, decreased sexual interest and sexual activity.