Here in the midwest, that work appears to be 95% done by 30 yr old guys from south of the border. At least the very few construction jobs I've seen since Baraq took office.
Re your post #55, that’s my point. It makes no sense to force old people to work at what is really a young person’s job. At a certain point one is old and tired and unable to continue working, especially at hard labor.
Those who have “inside jobs” and want to work until they drop, be my guest. To me, though, 30-35 years at something is quite enough and it’s time for a long rest.