A report published in the Journal of the American Geriatric Society, says that overweight elderly people may live longer than those of normal weight.
(But you've got to be overweight in the right way, a fine line between a few healthy extra pounds and being obese. And even if you're overweight, you have to keep active - sedentary lifestyles shortened lives across all weight groups. But I'll be alright, I've just been shovelling snow.)