So you're referring to social security, that's yet another part of the query and you put some helpful dates and on the ground observations confirming what I think. Mine was actually focusing on pensions and that sort of retirement benefit and the one off generation who got to enjoy it.
Almost all my parent's generation extended family, the WW2'ers had pensions and retired that way along with their social security benefits.
Yes and many think it is because THEY deserved it. They don’t recognize that they just hit the lottery on timing of their working years.