Why am I not Pregnant?
Generally speaking, a person with a uterus in their early 20s and 30s has a one in four chances of getting pregnant each month. After age 30, the chance of becoming pregnant decreases though, and by the time they are 40, they have a one in ten chances of getting pregnant each month.
By the time a person with a uterus is 45; their chances of becoming pregnant are very low.
The fertility of a person who produces sperm will also decrease with age, but that’s not as predictable as the decline of a person with a uterus.