Basically I agree with you. But with some older people the heart and mind may be youthful, but the body is unable to fulfill the "appetite for adventure".  Aging brings a lot more than wrinkled skin! This can be quite sad really because it serves as a constant reminder that we are confined within our anatomy despite our drives and aspirations. Personally, I think it would be even sadder  to die at 80 while feeling young at heart.