My friend is used to masturbate once in a week for a year to feel pleasure. Now he looks older and his hair starts changes its colour from black to white and his beard too. His concentration power reduces and feels weak, but he stills looks healthy but didn't feel from inside. Recommend some measures through which he can retain concentration and his black hair back since he is just 24 years of age. He somehow stops masturbations now. Kindly suggest some appropriate measures.