Generally, a man can still have children at age 51, but it is recommended to have a good checkup before making a decision. If men of advanced age still intend to have children, they need to do a good job of pre-pregnancy checkups, men mainly test the quality of semen and sperm, if there is no abnormality, they can usually have children. At the same time, they should strengthen physical exercise, such as jogging, which can enhance their immunity and promote blood circulation. Diet should be as broad and diversified as possible, usually eat more high-protein and high-quality protein food. Avoid smoking and alcohol to avoid affecting sperm quality. Usually men with age, sperm quality is declining, such as sperm density decline, sperm deformity rate is on the rise, sperm vitality is also reduced, which will affect the spouse conception. Therefore, if a man is still planning to have a child at the age of 51, he should go to the hospital as soon as possible for a checkup, consult a professional doctor and make a choice based on the doctor’s assessment.