It's utterly unrealistic- one in 14 of the over 65's has dementia. By aged 85, between 25 and 50% of people have dementia! Soon we'll be told it's perfectly possible for
Ageing life isn't all one lovely swansong where you gently decline, going downhill slightly bit by bit but essentially exactly the same only with a tiny bit less energy. Once you get a serious chronic health condition or disability or cancer or have a heart condition, which happens to an awful lot of people, life changes dramatically. My FIL has worked til he was 70 very ably, and was very much your active older person: within one year he has two serious health conditions diagnosed and is now pretty much bedridden.
Someone laughed and said that AIBU would explode if everyone had to take in their parents and care for them like in the past. I agree it would be awful! But it will not be possible financially to keep everyone going in terms of social and medical care in their own homes (nice big houses) til they are in their nineties, it's too expensive.
As for pottering about doing a little job, someone else mentioned their MIL working in a gift shop/FIl working as a gardener- that's what you do when you have paid off your mortgage and have some savings, that's not the type of job that could deliver a rental home and bills in the current financial climate. My parents have done incredibly well out of the boomer generation, and live very well off quite small pensions- but that's because they paid off their mortgages and only need living expenses. For the 40% who are now renting, this won't be an option.
I am quite pessimistic, because it all seems built on sand.
That's one reason why people used to have large families, to have lots of children so the chances are some would survive and look after them in old age. We do appear to be going backwards.
I'm not going to comment on the 'work hard and you will be rewarded' crap some posters are coming out with. I work much much harder doing longer hours for a lesser salary (% increase over last 5 years miniscule) than my parents earned doing a similar job- they say this themselves. They have a lovely big owned house, paid off mortgage, a salary linked final pension, and holidays and a nice life (cheap but not worrying)- I don't have one of these things!