Today he in good shape. But look at him when he'll be 50 or 60 years old.
The older we become the better the differences of the health between people.
Hmmm, my dad is 50 or 51 I think and he looks amazing, every woman comes on to him practically, he smokes and eats all sorts of cooked food, the only thing is he exercises a lot, and in general is a very happy guy. He bikes like a maniac, many younger bikers can't keep up, he did a distance swimming race in a lake last summer and came in 2nd, there was 20 young healthy dudes in the race, the guy who came in first was 20 y/o and in great shape....
One thing my bf. does which is good is he never ever overeats, he eats raw stuff sometimes (including raw meat), cooked stuff and junk sometimes, but all of it in much smaller quantities then the average guy, he is hardly ever sick (I think I saw him sick maybe 5 years ago when he overate oily roasted nuts lol), he smokes too, he is 36 by the way ... his father is over 60 and looks pretty good for his age too...
I have seen some other older people looking pretty good on all sorts of diets...exercising, not overeating, and general quality and happiness in life, as well as genetics, seem to all play their part. The point is there are too many other factors involved.
If you don't exercise, your bones and muscles weaken with age, no matter how your diet is...and you will get all sort of problems in old age if you do that, no matter what you eat.
Maybe someone who is on RAF and healthy lifestyle will look & feel better then someone regular diet & healthy lifestyle at 80 & 90, but then WHO CARES! lol ... Really.... at 90...who cares how you look, as long as you stayed active and healthy and don't overeat sugar and processed foods and get all your necessary nutrients....
Also if you take a look at some of the longest living people in the world they are all on different diets, whatever worked for them I guess

The point is I do this diet because it makes ME feel good, NOT because I think it will make me look better at 60, not because it will make me live forever! I couldn't give a crap if I died at 90 or 100...as long as the life itself was good and meaningful.