If you start school at 6 years old and have 12 years of mandatory school then the graduates are 18. So, that’s the “start of work” age back in the day, setting aside the minority of folks that go to college.
But then college kids got into a bunch or trouble with excess drinking and “it seemed like a good idea” to move to 21 in some jurisdictions. There is no “reason” for any of this, it’s just what legislators could get agreement on.
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