I use to think when I was 65 I'd have all sorts of aches and pains and be hobbling about with a cane. But the fact is I feel no different than I did 20 or 30 years ago and there's nothing I did back then I can't do now (if maybe a bit slower). Retirement at 65 now seems absurdly too early.
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On the other hand, because of automation and transfer of manufacturing out of the country, there are not enough jobs to go around and delaying retirement of old people only exacerbates this problem by keeping jobs from young people who need them. It's the biggest dilemma our country has today.