I just read a joke about turning 80 on another board. My experience is that this milestone doesn't mean much until you approach it yourself.
I have done, and continue to do, a few of the things on the doctor's list; i.e., alcohol, sun exposure, and red meat. I will be 70 in December. Keith will by 79 in May. He has done some of the things on that list, too. He smoked. He leads a clean life now after being so ill.
Keith has commented several times that he benefited from the fall and its subsequent consequences. I can tell you that I was, and probably still am, damaged by it. But I think that Keith was humbled by his experience.
Incidentally, is brother turns 80 this year. As many of you know, he is recovering from West Nile Virus, but continues to improve.