That's just not true. They get considerably older than 82. Jack Lalanne (died at 96) and Bill Pearl (living, 91) being just two examples off the top of my head. It's the ones who abused steroids who don't get to old ages. Bodybuilding, in its natural form, is one of the healthiest things you can ever do for your body as you're working every single muscle in the body, including the ones that are often neglected. Not exercising muscle groups leads to immobility and muscle failure as you age.