It depends on the family where I'm from but most of them will live alone as long as possible and if you cant afford retirement homes you'd take them in.
They're usually considered the most wise and pillars of the community. We tend to stay living at our parents' homes for a long time, or otherwise build a house nearby or often even on the same land itself. We're really a very tight-knit community so. I personally don't know anyone who ended up in a retirement home or something - you'll sooner find them tending their gardens, farms or organising activities within the community for the youth etc.