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Nobody was eligible for SS at age 55, but they did gradually increase the full retirement age for SS (FRA) which is probably the majority of the change you see
by rufus_foreman 2y ago
Nobody was eligible for SS at age 55, but they did gradually increase the full retirement age for SS (FRA) which is probably the majority of the change you see in that graph (note the axis).
Probably other changes too, but I would guess that's the main one.
Average (meaning median) US retiree has jack shit other than SS and hopefully their house.