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.
When I went to uni, there were a few mature students.
Maybe 50 years ago? Not for the last 20 years at least. The average 30/40 year old is in debt, nevermind having savings.
I lose my job at 35. I now have 75k in liquid savings. I spend the first 6 months looking for a job, now I'm down to 65k, I decide to retrain. That's 10-20K and 12-24 months if I go to Community College. So I'm dead broke by the end. If I have to buy a car, or break an ankle I'll never make it.
So I get a part time job in retail making 10-12k a year before taxes just to help defray the cost and to keep the unemployment gap on my resume smaller. Great I make it through. Except now I'm 37 looking for a job in a field that I have no previous work experience in. So I keep my retail job and try to squeeze enough hours out of it keep everything together, or I get a second job. Now I'm a constantly stressed and exhausted 37 year old paranoid about taking a day off to interview because what if they cut my hours in retaliation for missing a shift who is looking for a job in a field that I have no previous work experience in.
This "works" if I'm in Albuquerque when I lose my job. If I live in Carrizozo or Tucumcari? I'm kinda fucked.