No comparison at all. My Grandpa could work your ass off at age 70. Of course, he was a farm boy, worked every day of his life. 42 years old is still young, if you don’t sit in front of the TV every day vegetating.
In the 60s my Dad had a Laborer Foreman that didn’t retire until he was past 70 and I worked with him. Every day when done he would return to his farm and work to 9:00 at night and then go to bed.
I was fifteen feet away when a pallet of brick fell off a scaffolding and cascaded down on him. Took him to one knee, but he shook it off and cussed those who weren’t already gathering the brick back up to re-lift.
Use a 16 lb sledge all day or run a 150 lb breaker in a visqueen cage, and you will know what tough is.