I know sheetmetal
My Dad had been a sheetmetal worker since 1959, before I was around.
I can still remember being 4-5 years old,I would go to work with Dad on saturday when Mom was busy. He would set me up on a fabrication table in the shop tell me not to move,go over grab a 10 oz. Pepsi from the machine and use his snips to pop the cap off and hand it to me,i'd sit there and watch.
I went to work full time during the summers when I turned 14 for the same company my Dad worked for,11 year later I was a HVAC contractor at 25,that's been 24 nearly 25 years ago...Where'd the time go??