[T.B. Yoits]

The younger ones are much more likely to be middle to upper-middle class kids living at home, going to college, with better career prospects ahead.

Outside of a few trendy hot spots near their college campus, middle and upper middle class kids are not working as wait staff.

[9YearLurker]

The average waitress is in her mid-20s and works as such for about a year, with 2/3rds of them having at least some higher education:

https://www.zippia.com/waitress-jobs/demographics/