I think it is unreasonable to compare how AC look after aged parents now compared with what happened in the past. Our ways of life were very different 20, 30, 50 years ago and every society adjusts to its times
Most families are not in a position to offer elderly relatives the care that previous generations gave. To begin with, most women work and their families could not manage without their income. AC may be divorced and single parents, which makes undertaking the care of older relatives very difficult.
Modern houses are small and the days when grandma would be expected to share a bedroom and even a bed with a grandchild, or sleep in the living room are long gone.
We live much longer and live longer with illnesses that, in the past, would have killed us at a much younger age This also means, as we live longer, we are more likely to have dementia in old age and, even those with no experience of this disease, will have read enough to know that caring for someone with dementia can be, quite literally, a 24/7 task.
As this thread shows, the days when elderly parents expected their children to look after them in old age have gone, as are the days when a daughter could be told that she should not marry as her duty was to stay at home and look after her parents in old age.
Many of us now are quite clear that not only do we not expect our children to be our carers in old age, we actively do not want them to do so. Manage our affairs, possibly. Visit us regularly definitely. But undertake our care, fitting it in between earning a living and bringing up children, definitely not. Many would prefer to be in a caring environment designed for their needs and looked after by professionally trained staff with all the necessary equipment for their care.