When is it too late for pregnancy? 

According to ACOG, For healthy couples in their 20s and early 30s, around 1 in 4 women will get pregnant in any single menstrual cycle. By age 40, around 1 in 10 women will get pregnant per menstrual cycle. A man’s fertility also declines with age, but not as predictably.

If you are older than 35 and have not gotten pregnant after 6 months of having regular sex without using birth control, talk with your ob-gyn about an infertility evaluation. If you are older than 40, an evaluation is recommended before you try to get pregnant. This advice is especially true if you have a problem that could affect fertility, such as endometriosis.

 Older women tend to have more health problems than younger women. For example, high blood pressure is more common in older people. Having high blood pressure before pregnancy can increase the risk of preeclampsia. But studies also show that older women who do not have any health conditions can still have complicated pregnancies.