I’m 46 and can still do 48 hours straight if necessary. In fact did a couple months ago working on a nasty math/crypto issue.
What a whiny wimp. Guarantee he/she/it is a libscum...
I’m 58 and had to do 56 hours back in August. I did it because my project had to succeed and I believe in what I do.
It wasn’t physical labor, but the mental part can exact a physical toll too.
But it did take a toll. I have to avoid that.