One could also consider that the posts HERE are artificially skewed for age and dementia, because as somebody else said, we come here and talk about it because it's causing us stress of some kind, ongoing or emergent. We don't come here because our elderly parents are fully functioning and don't need our help and "Whoopee, life is EASY!" We come here for advice on "HELP, WHAT NOW" because the elderly relative either wants something it's not easy for us to supply, or has needs something it's going to be difficult to supply, and the relative is in denial about their abilities, or we and other relatives are in denial about the elderly persons abilities and faculties - and the work and the stress and the discussion and the lost sleep and possibly tears are going to fall on US, for whatever reason. Because we're adult women (and a few men) and it lands on us to handle it. Sometimes or all the time. And we want advice, and comfort to help us handle it. So we come here, and we DO get advice.
So, I agree that it looks worse than it is in actuality across the populace, but HERE is where we get the help we need... And we really need it.

It ain't fun being the one looking at the wreckage of your relative, who can't do anything she used to do, who can't always finish a sentence because she's forgotten how it started. Who needs help we don't always now how to give. These are our internet friends, and they help us and comfort us.
And I am seriously grateful for it, because even if
I don't have a particular problem I'm reading about, it may crop up later, and I'll remember how it was recommended to handle it, and by golly, that's a big help TO ME.