To draw big conclusions like that you can't really look at individual cases without considering the person's other health & genetics. My 2nd cousin had epilepsy and apparently hadn't been takign his medication and suffered a seizure and apparently had a stroke in the middle of it and died in the middle of it. Then at his funeral, his grandfather had heart attack. And all of this during & after Hurricane Wilma in S. Florida. So there you have a kid who is 32 die and the grandfather who was well into his 80s.
I think the quality of your life is improved considerably at any age if you follow a healthy lifestyle. Let me bring up a recent situation for myself. I have been training since I was 16 and competition dieting the last 5 yrs. Two months ago I was 2 weeks out from a figure competition and then bailed out to start workign on a project w/ a friend which turned into a full time job. So between the stress of working my regular job plus this project, and then switching to the project as my full-time job and goign head first into workign for a startup w/ no structure or processes / procedures for regular work days 7 days per week, min 12 hrs / day. I stopped training & dieting because of the time required and the stress, and generally just wanting a break from competition dieting. So its been about a month since I stopped training & dieting. After just one month my upper back is screwed up from stress and my lower back & knees hurt just in general from lack of use. This is all a direct result of not training. I've been thru other more stressful moments in my life but this particular one is really playing havoc on my back. All from lack of training.
So even at my age w/ my 98% healthy lifestyle, I let that go for 1 month and everything starts to fall apart. I know lots of people who are around my age who have just given up on even feeling like they have a right to a quality lifestyle because they are scared to train, feel like they are too old, don't want to, have too many aches & pains, whatever. Its all a crock of shit. I plan to fucking be riding a Harley when I'm 90, so I need to make sure my body can at least hold my weight up so I don't end up propped up in a chair & drooling on myself at age 60.
Another example - my parents are both over 65 - they walk 5 miles / day, do step aerobics 3 x/ week and work all around the cabin where they spent the winter while waiting for their condo on the beach to be finished. They do landscaping, haul rocks, rebuilt the dock, rebuilt the shed, my dad actually refinished all the wood trim in the house doing all the custom edging etc on wood they foudn in the ceiling of the old cabin after they tore it down to rebuild the whole place.
That's what I call quality of life. They chase my 2 & 4 yr old nephews around probably w/ more energy than I have.