TestosteroneBlood serum testosterone levels of a 30 to 40 year old woman range from 15 to 100ng/dl and from 300 to 1200ng/dl for men. For men and symptoms of male menopause, a frequent problem is that the testosterone level that is good for one man can be different than the necessary level for another man. … Continue reading 7 Male Hormones That Decline After Age 30