There are four main factors that affect fertility:
Fertility tends to decline with age, particularly for women. Women are most fertile in their 20s and early 30s, and fertility starts to decline significantly after the age of 35. Men's fertility also tends to decline with age, although not as significantly as women's.
People need to be in good health in order to be fertile. Poor nutrition, unhealthy lifestyle choices like smoking or excessive alcohol consumption, certain medical conditions, and many other factors affect fertility.
Ovulation is the release of an egg from the ovary. It's is an important factor in fertility, and if a person is not ovulating regularly, it can be more difficult for them to get pregnant.
A low sperm count or low quality sperm will make it more difficult for a person to create a child.
Covid may impact your fertility. For more information, read our in depth review of COVID and male fertility.