The jobs I worked at 14 would now be considered a violation of Child Labor laws passed since.
Coming from a farming family, even though my dad was not a farmer, I worked in tobacco fields as soon as I could do something useful, picked bushels of tomatoes, baled and hauled hay, stacked bales in the barns, moved cattle and even helped shear sheep. Yep, I remember stomping the wool down in the wool bag and coming out oily with lanolin, as much as being covered with 'barn trash' after stripping tobacco or seeds and dirt from baling hay.
While the heavy construction work, building seawalls and piers was darn sure work, dirty, and as a side effect got me in the best shape of my life, it would not be allowed today.
There's the rub. A work ethic, the willingness to sweat and get dirty for a paycheck, just isn't being instilled at an early age, or even by the mid teens in most, especially in urban and suburban settings. Wait too long, and it isn't likely to happen at all.
Look instead to the guy who is mowing your lawn, roofing, doing drywall, and keep in mind his English will improve.
Notably, most of the oilfield hands I have known either grew up on a farm or ranch, in an oilfield family, or were veterans, all folks who have dealt with having to sweat and more than a bit of hardship in their day.