I've read that many people, regardless of lifestyle, fall apart rapidly in the later 80s. Smoking, drugs and drinking can shorten that, but even those who have a careful diet, exercise regularly and don't have hereditary diseases will suffer a big decline in their vitality and health at that point. I think, if it's true, its nature's way of preparing us for accepting death nonchalantly. Who really minds when you feel like crap every day, your compadres are all gone, and you are all alone with yellow piss stains in your drawers? Having said all that, I am noticing my friends and family showing increasing signs of age and it makes me sad. For myself, I'm with Woody Allen on this one..." I am not afraid of dying but I don't want to be there when it happens".