You do realize that the skilled trades are physically demanding, and usually by the 40s or 50s as a tradesman you are either in management or counting the years

You do realize that the skilled trades are physically demanding, and usually by the 40s or 50s as a tradesman you are either in management or counting the years till union retirement, or you're probably on disability from the injuries years of working in them can cause? I mean, you do Hvac or electrical work, you're not doing it in a comfy ac office. You're working in summer heat for long shifts, lifting 100 pound boxes of tile. Not like the average 40 year old is going to be able to be an undersea welder, or will have the stamina to work as a welder on the shop floor.