My helper last year was 19...150 lbs soaking wet.
Wimpy... Would not jump off as soon as we stopped because it was too cold to wait 1 second to get the box. Stood in the cab and then opened the door after I got him the pkg. He was posting Snapchats all day..."look at me the UPS driver".
His favorite thing to say "You guys work way too hard".
Lasted 1/2 day. I dropped him off early.