While it is important to understand how long sperm can live in your body, the best time to have sex for you and your partner may vary. The ideal time will depend on factors that include:
Age . As men age, their fertility tends to decline. However, older women may be able to get pregnant later in life. For example, if a woman is 40 years old when she becomes pregnant, she might deliver her baby at 39 years of age or later—even if the father was 18 during conception (although this is rare).