How old can a man father a child?

A man can father a child at any age after he reaches puberty, typically around 12 to 14 years old. However, the quality of sperm and overall fertility can decline with age, particularly after the age of 40. While there have been instances of older men fathering children, the likelihood of genetic issues and complications can increase as age advances. Generally, men in their late teens to early 30s are considered to be at their peak fertility.