I am now 65 years old and masturbate since I was 9 Age on a regular basis ie daily. (For many years I have masturbated regularly three times daily.) That's 57 years. In that time I have masturbated about 26 900 times. Even now I masturbate on average 1.9 times per week. I have therefore the exact numbers because I have had interest from a sexual diary. Check out the link at times, I'm Mr.Z.
http://www2.hu-berlin.de/sexology/GESUND/ARCHIV/MAY_99.HTM
I've tried (out of interest) get along without masturbation at the age of 23 years, 21 days I have endured, it was hell. I kept that exactly 21 days, so my first and experienced only nocturnal pollution.
Addict on sexual behavior, there is still an interesting link.
http://www.aerztegesundheit.de/sex1.htm
Incidentally, health impairments, I have not found until today. So do not worry.
I masturbate even better than I GV.