A 70-year-old man who can have a normal erection and complete sexual life with good quality sperm has some fertility and the possibility of having children. However, the quality of fertility decreases compared to the optimal age of fertility, and in most cases 70-year-old men have difficulty meeting these standards. Men’s fertility is maintained for a longer period of time compared to women, and the testes decline more slowly and can still produce sperm and achieve fertility through normal sexual intercourse at age 70. The quality and quantity of sperm in men will decrease accordingly with age, as will the chances of pregnancy and the subsequent decrease in the likelihood of normal embryo development after pregnancy. In addition, as men age, they may suffer from prostate disease that affects the quality and quantity of sperm, resulting in decreased fertility. It is also important to note that the age of 70 is already an advanced age, and even if the child is born successfully, the probability of the child suffering from mental illness is higher than that of people born at the optimal reproductive age. Eating protein-rich foods, such as eggs and lean meat, can help improve sperm quality.