Dear Welcome to HCM We understand your concerns I went through your details. A man can indulge in sex till he is physically healthy. Man do not have any upper age limit to perform sexual intercourse provide he is healthy and able to maintain his erection and ejaculate. After the age of 18, a man can masturbate thrice or four times a week. Masturbation consumes energy and could be addictive. Therefore moderate masturbation practice is advised. But there are no health related issues with masturbation. Excessive masturbation / sex do not have any health problems and it do not reduce the life expectancy. I need to warn you. Your questions are clearly showing that you are thinking too much and are being obsessive with sex/ masturbation matters. I suggest you not to do so. This could lead to anxiety disorder. Concentrate on your education or career. If you require more of my help in this aspect, please use this URL. http://goo.gl/aYW2pR. Make sure that you include every minute details possible. Hope this answers your query. Available for further clarifications. Good luck. Take care.