All practical advise here is good, but the real issue is mental capacity.
We all think, we'll keep on going, thinking the way we do in our 50-60-70ies, but our outlook and look on what is important and sustainable for keeping up an everyday life change. Both due to physical and mental capacity.
Ad to that mix long term illness that change a person and dementia etc. the 60 years old who once swore they would never rely on dc, cannot see they are doing so, they feel they get on with things, blocking out that they might actually only sit on a chair all day without assistance, but it will be seen by them as doing it themselves. The lifeadmin., the food preparation/delivery, the trying to get them to eat, the non-recognizion of incontinence, it will be blocked out by many and if not, it's too much to deal with.
Sadly this is how many many people 'evolve' in old age, and I think that's the real problem. I've no solutions, only get cleaners, gardeners and carers before capacity is failing, because then the old person won't accept 'strangers' helping.
There is a thread 'cockroach cafe' (hope it's ok i refer to it) where all this unrecognized loss of ability is very obvious, I'm sure those elderlies never ever thought it would be them. I can recommend you take a read.