I know, but that's not the biggest reason for retirement. Remember, a lot of people despise their jobs - they're looking to get out as soon as they can. A lot more don't really hate it, but wait for the time when they can quit working financially(due to pensions, etc.), and leave as soon as they can, because retirement is seen as more fun. Those aren't dependant on aging.
A lot of people who say they're looking to get out of retirement as soon as they can are optimising for it very poorly, as the early retirement community will argue and in many cases demonstrate. If you're in a sufficiently high-earning job OR are sufficiently frugal that you can save two thirds of what you earn or more and still enjoy your life with expenses at that level, you can retire in about ten to fifteen years. Social effects dominate - if you earn three times the median salary or more, probably most of your peers earn comparable amounts and spend ...
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