Lessee now, starting from 10 years old:
Paper routes (5 years worth)
Lawn mowing (bought my own mower & gas)
Picking crops (strawberries, green beans....)
Stacking cherry crates -- one season
Service station (back when
service was the norm) -- two to three years
Restaurant dishwasher (& food prep & busboy) -- a few months was more than enough
Install C.O. (telephone) switching equipment -- over nine years
Telco equipment maintainer -- four years
Cable splicer/Lineman -- 28+ years
and soon to be retired....