I have the same observation, and I’ve often been curious about it.
I think truthfully, if we do anything for too long our bodies overoptimise for the task and we lose the benefits to fitness and other health issues also creep in.
Young construction workers are often extremely strong and fit, but nearly all the 40+ ones I know have a huge gut and sound like wheezing ICE engines.
There are a handful of exceptions of course, but as far as it goes the general rule is this.
It could also be that factors surrounding the culture of construction workers (lots of alcohol to wind down) are huge contributing factors in of themselves.
Too many variables.
> It could also be that factors surrounding the culture of construction workers (lots of alcohol to wind down) are huge contributing factors in of themselves.
Terrible food, too. I'm not in construction but I do have to tour worksites for my job somewhat regularly, and pretty much everybody is eating some combination of greasy kebabs and mcdonald's.
I like me a juicy kebab as much as the next guy, but eating just that for days on end can't be good for you.
Now they're certainly more active than a keyboard warrior like yours truly, but there seems to be a consensus around not being able to outrun / out-train a bad diet.