There are still jobs like that, but living standards have increased so much that they aren't considered worth taking when you can hold out longer for better ones, to the point that it's considered like a "boomerism" to suggest doing jobs that people in other countries are happy to take to live at a 1970's standard of living.
Even in the US there are seasonal blue collar jobs like that. Youth generally last until 25 or so now though, and that's partly just a skill issue/matter of mindset, because it didn't sound weird for a 20 year old to work in a factory or on a boat back then like it does now.
IMO the giant difference between now and then is the massive gap in income/wealth between people just starting out or working 1970's style jobs, and jobs with global reach and high leverage (ie the most capable produce 2-100+ times the value, but the average person produces nothing of value or negative value). There are WAY more opportunities to benefit from that now than there were in the 70's. I think that's what causes most of the angst tbh, that there is so much more opportunity cost and variance in outcomes now because of global trade/technology, if you just want to work to live you're not going to the same results as people who live to work, or people living places where they literally have to "work to live".
To be honest I don't think the boomer mindset of just working to live and play with your expensive toys was ever a very good one, because it led to the consumerism that makes people think they need $10M to retire or seek $200k jobs right out of college without actually wanting to do those things enough to achieve them (and not needing them anyway)
Hard pass, I'd rather talk to his union rep.