Actually in the modern era SSNs are assigned randomly. Anybody born before about 2011 who hasn't needed a re-assignment will indeed have SSNs which in some sens

Actually in the modern era SSNs are assigned randomly. Anybody born before about 2011 who hasn't needed a re-assignment will indeed have SSNs which in some sense contain information, but after this date they're just arbitrary numbers (though only a subset are ever issued, no real people's SSNs have "area number" 666 even though these are now random)