How Age Affects the fertility of men and women

Age is the single biggest factor affecting a woman’s chance to conceive and have a healthy baby. A woman’s fertility starts to reduce in her early 30s, and more so after the age of 35.The risks of pregnancy complications increase as women age.

Male fertility decline is more subtle, but a man’s age affects the chances of his (female) partner conceiving. Male age over 45 years increases the risk of miscarriage, and the child’s risk of mental health and developmental disorders. Age affects the ability to conceive and have a healthy baby for both men and women.

A woman is born with all the eggs she is going to have in her lifetime. Her eggs age with her, decreasing in quality and quantity. Age is the single most important factor affecting a woman's fertility. While good health improves the chance of getting pregnant and having a healthy baby, it does not override the effects of age on a woman's fertility.

A woman in her early to mid-20s has a 25–30% chance of getting pregnant every month. Fertility generally starts to reduce when a woman is in her early 30s, and more so after the age of 35. By age 40, the chance of getting pregnant in any monthly cycle is around 5%.

The risk of pregnancy complications increases with age too. The risk of miscarriage and chromosomal abnormalities in the fetus increase from age 35. Complications such as gestational diabetes, placenta previa when the placenta covers all or part of the cervix, which increases the risk of the placenta detaching, caesarean section and still birth are also more common among older women than younger women.

Conditions that may affect a woman's fertility include endometriosis and polycystic ovary syndrome (PCOS).

While the effects of female age on fertility have been known for a long time, more recent studies have found that the age of the male partner also affects the chance of pregnancy and pregnancy health.

Male fertility generally starts to reduce around age 40 to 45 years when sperm quality decreases. Increasing male age reduces the overall chances of pregnancy and increases time to pregnancy (the number of menstrual cycles it takes to become pregnant) and the risk of miscarriage and fetal death.

Children of older fathers also have an increased risk of mental health problems (although this is still rare). Children of fathers aged 40 or over are 5 times more likely to develop an autism spectrum disorder than children of fathers aged 30 or less. They also have a slightly increased risk of developing schizophrenia and other mental health disorders later in life.

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