Does everyone fall to bits in old age?

It seems as if currently the human body tends to wear out by the mid-to-late 80s.
I wonder if (with a lifestyle optimized for health and longevity) that could be pushed another decade?

It seems to vary a lot OP. I’m sorry to hear of your parents’ struggles. I am also wondering how old they are.

My mother is 87 and though she has definitely got more frail the last few years is fairly OK. She sleeps a good bit and has become housebound recently because she can’t do stairs now but has no other pain or illness symptoms, despite diabetes and some mild arthritis. She is occasionally forgetful but her mind remains sharp in most ways. My father died suddenly of a heart attack aged 63 (he was a heavy smoker).

I am in my early 60s and seem to be struggling with various minor ailments, including eg arthritis and painful arms (ligament ageing) which are beginning to affect me. Plus some other unpleasant “minor” issues and investigations over the last few years that have affected my daily quality of life. So, on one level, I am in fact starting to feel myself “fall apart”. I am needing to start exercise to control some of this, but it’s hard to maintain the habit.

Gosh, that sounds really tough, how old are they?
Just to add DF died just sitting in his chair and had a bit of heartburn (this was after having spent the morning with his best friend). He was 83yrs, a friend's MIL also just died in her sleep having no previous ailments at all, no falls etc, she was 88yrs so not all decline from illness, just frailty i suppose.

In my experience, a few fall, break bones, and die a few months later. Not sure what of - pneumonia perhaps if they can't move around? Shock?

Also Ive known of deaths from cancer, heart attack, kidney disease, dementia and stroke.

No idea what the stats for these are but I think that covers all the elderly deaths I've known.