Can a man still have children with a woman when he is 70 or 80 years old?

Not necessarily. A man in his seventies and eighties may still have normal sexual function and fertility if he is in good health and mental state. Male sexual function is a very complicated nerve reflex activity, which is closely related to psychological factors and mental factors. And the fertility of men is different from that of women. Generally, after menopause in women's fifties, the ovulation function of the ovaries is gone, and the fertility is also lost. If a man can still have a normal sex life and normal sperm at the age of 70 or 80, he is fertile, that is, he can have children.