I am 45 , and i am addicted to masterbtion , so is health to do so in my age ?

Addiction: Addiction suggests that you are imperiling your job, your family ties, and willing to supply your "habit". I don't think that frequent masterbation fits the definition unless you're doing in public and at work. If you think you are doing it too frequently, then keep a diary for a week to keep an accurate number then try decreasing the rate by 10% per week. Slowly stopping isthe way to success.