Even at home while working late at night, I still get eye problems on dark themes, and I still have to bump up the scaling a lot on a 31" 4K monitor, to the point of losing screen real estate.
Is it just me getting older, or am I just using a bad setup.
FWIW, that sounds like a side effect of having had too many birthdays. It happens to all of us, but affects some worse than others.