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Part of that may be because so many Americans don’t have a pension at all.
Perhaps we should look to pull this kind of thing in America, if such a moment arrives. >

It already happened under President George W. Bush. The US retiremtent was raised from 65 to 67 with early retirement set to 65. If you where born before I believe 1954 your retirement is still 65 but after that your retirement is 67. Other than a few radio host going nuts at the time no massive protest happened on a national scale.