alt Hacker NewsI think there's probably more going on than that one chemical. For example, if I don't go jogging for a week and then go for a run my shirt later after it dries smells like urine. I looked up why and it's because urea builds up in your skin and is excreted with sweat. Maybe this fact just made me paranoid but I swear that I can smell a urea smell on my skin when I don't exercise regularly.
I imagine elderly people aren't out sweating regularly.
I get exactly the same thing. It crept up on me over the past decade of a life where people commented I had to little to no actual distinctive smell, and alas, now I do. What will really make it come out is if I have 2 or more alcoholic drinks the day/night before. The smell reminds me of a friend/coworker from the '90s who didn't bathe regularly and P U.
Daily sweaty cardio is more than enough to control it for me as well. But if you can't, deodorants like Lume cover it up and as others have posted and there are soaps that work better on it than others. I occasionally put all my athletic clothing through a hot wash myself because as someone once said on BlueSky, all clothing is washer-safe if you don't care what happens to it.