We might need to add a new discussion about what qualifies as “retro” and what not.
I draw the line at the technical limitations. Something around year 2000, when GPUs began to be the standard and graphics in games switched from make clever use of what you have to do whatever you want and buy new hardware in case.
So while GTA3 is 17 years old, I can’t consider it retro. I’d have problems even in considering Half-Life a retro game. Mayyyybe Fifa 98. Maybe. Not even Grim Fandango.