Can Anything Be Done To Restore Sperm Production In An Elderly Person, Or Is It Inevitable Due To Age And Weight?

hi i am a 76 yr old man my problem is i can maintain a erection with no outside help such as pills or salves or creams but i am not producing semin or sperm anymore at all i also weigh 255 lbs is there anything i can do to correct this or am i doomed to it because of my age and fat