it is a very complicated subject... I think the idea of social safety nets failing if there are too many old people is quite scary, but I can't say I'm truly convinced it would happen just yet.
Maybe these are necessary growing pains so we can polish how society functions even more. It's not like we reached the pinnacle of "good living" for everyone.
I think we need forward thinking to find ways to cope if this continues. It should all be about sustainability, but economics has been driven by 'growth'. That is coming to bite us now.