There are many, many different factors to take into consideration regarding care of the elderly. The points almondpudding makes are true. Some of those points would also be true in the UK, except that we have a state pension, so the second point is moot, and points three and four are cultural in that often, people (both men and women) brought up in the British culture would rather live alone than with distant family. Luckily, for the most part, in Britain, elderly people are able to do that because of the state pension/welfare state. We also have state-funded nursing homes where elderly people can go if they are unable to look after themselves, and family are not equipped to do so - perhaps they all work (more and more common these days with households needing two incomes), or they can't afford a big enough house to fit the elderly person in (again, more and more common).
Dh is from a middle eastern county, and works in a care home here in the UK. At first, he had the exact same attitude as that young lad from Afghanistan that we're talking about here. But what he sees now is that the burden of care is always down to women, and that the elderly people are often victims of abuse, if not neglect, since nothing is regulated and no-one checks on whether the elderly people are being looked after properly or not.
It is indeed a nice dream to be cuddled up in the bosom of your family in your dotage, to be looked after by your daughter/son/daughter-in-law/son-in-law/grandchildren, but those people will all be working until they're 67 so who is going to pick you up off the floor or take you to the loo between the hours of 9 and 5? And what if those people have dreams of their own, perhaps to take a three-week cruise, or even just a week in a caravan in Dorset? Do they have to take you too? What if you are so frail by then that you can't travel? Does that mean they can't go because there is no-one else to look after you?
Do you, at the age of 95, really want your 75 year old daughter to be up in the night two or three times helping you to the loo? Or would it be better to get your 45 year old grandaughter to do it, who has only just started getting a full night's sleep each night now that her youngest is 4? I'm deliberately using women as examples, because as I said, it will almost certainly be the women that do it.