I guess I am that old: I started computing on a green-on-black Apple ][, and later moved to unix on a VT320 terminal. I have stuck with green-on-black in my terminal ever since. I love to work in a darkish room, and thus also like my desktop dark to avoid getting blinded by my screen. I'm pretty happy with the "dark mode" movement of the last few years!

Also, I wear glasses and find that white-on-black suffers quite a lot from chromatic aberration; green-on-black does not have this problem and results in crispy sharp text on any brightness level.