Whether you are a man or a woman, your hormone levels will start declining as you grow older. For most men, the key hormones that drop off include DHEA, testosterone, and the Human Growth Hormone. The glands located in your thymus, pancreas, testes, and brain will start slowing down, thus affecting the production of youth hormones. Each year, your body produces less of the hormones you need to stay mentally fit, strong, and sexually active. You will also start experiencing the usual symptoms of male menopause, which it includes decreased sex drive, poor erections, low energy levels, uncontrollable weight gain, and irritability.