Does the chronic practice of masturbation, even if at spaced intervals, cause harm, and would stopping it now enable a normal marital life in the future, and what is the ruling on prostatic fluid (madhy), and how does one perform ghusl (ritual bathing) from it?

Masturbation is forbidden by Islamic law, and one must offer sincere repentance for it. A person who repents from sin is like one who has no sin. With repentance, life will be normal without future problems. As for the health harm, you can refer to the consultation department. One must immediately abandon this habit with sincere resolve and turn to Allah. Madhy (pre-seminal fluid) does not necessitate ghusl (definition) (ritual bath), but only wudu' (ablution), along with purifying the affected area and clothing.