Hello and welcome to ‘Ask A Doctor’ service. I have gone through your query and here is my advice. I would like to tell you that your doctor was absolutely right in saying that masturbation has absolutely no negative effect on erection strength, size or sperm count. I would also like to tell you that as a man age, his testesterone levels decrease gradually over time which is the main hormone responsible for sexual health in males. Thus as you age, the naturally decreasing testesterone levels will show its effects on your sexual health. Also I would like to say to you that think of masturbation as a point to relieve your sexual tension and don t make it a habit or routine. Thanks for trusting and posting your query on this forum. Hope this will help you. Feel free to ask any further question. Regards, Dr. Abhijeet