That requires culture in which it is expected of kids to support parents in old age. Or at least a culture that does not see that as a bad thing.
There are those who don't have kids (or the kids are dead). There are also those who the kids have moved far enough away that they can't really take care of the parents like they want to. However those are not actually the majority cases.
Those cases are very over-represented on HN compared to what's typical nationally and may very well be the local majority here.
May parents have to first pay for childcare and then have to help out their parents.
They have jobs in their own, until they are too weak for those. And then, they are also too weak to be primary childcare. Mutual help do a lot, but asking them to replace childcare is unrealistic.