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Anecdotally I've seen more and more 60+ workers doing line-level gigs like cashier or low-skill retail than ever. I think there's an undercurrent of discrimination against youth, actually, in that the 55+ group will be dependable and complacent because they need to work and therefore will show up to work.
In the modern US economy, longevity in one firm or role is actually bad for a young person's career! There are no pensions to earn. There are limited annual raises that are lower than inflation. On and on and on.
I'd be a lot more sympathetic to the plight of the elderly in such a position if they weren't, you know, basically kicking away the ladder they used to climb to the top, spend the country broke, and then continue to vote entitlements while passing a faux-future of success demanding everybody get a Bachelor's to even be a Secretary answering phones. This whole system is so broken pointing it out sounds extreme or mean, but it's just obvious to me over these past 15+ years of working.
I just got my SS statement the other day, and was extremely proud to see that every year I was eligible to work, even if I was going to school / college / etc, I did work. Not a single year without an above the board job. I don't think a lot of Millenials will be able to come anywhere near it, and I don't think it's entirely their fault. End of my $0.02 that is really worth about 1/8 of that...