About 45 is the turning point for most of us. If you have a healthy lifestyle and diet at that point, you can go on past 55, 65, 75 and 85.
Age is a challenge to the mind and the body. But like every challenge I've ever met, I have risen to it. There is an entrenched belief in society that getting flabby and sedentary and disconnected from life is an inevitable part of the aging process. But that's just not true.