Like, young enough to still be enjoying things. Sure, I felt the same way for first decade. This is all fun.

But later. Not old enough yet to have done 24x7 support for a few decades, sleepless nights, 80 hour weeks, working on Christmas Morning, to be ground down by angry and demanding users. ( no fault of their own because of their own turnover. ).

Lack of sleep and stress takes a toll on health. So 'age' becomes a factor, because the body gets ground down. Seems like the 'optimistic' takes remind me of just starting out.

But, it is probably more of which industry you are in. Results vary.

Flattered that I apparently come across as still in the full flush of youthful naïveté.

I’m 25 years in to my software development career and still finding joy.

eg video games sound like such fun to work on, but every report I've heard of from people who actually work in that industry make me run away screaming that I've never had a programming job in that sector.