I always thought that in the comics Ollie was one of the oldest leaguers, because they mention all the time that there’s a significant age gap between Ollie and Dinah. So to me that means he’s probably like Superman’s age(I always assume Superman is the oldest of the non-god/martian/reincarnated/immortal/robot leaguers), early-mid forties. However they do mention the Dinah is a bit younger than the founding members, like Batman, Barry Allen, Hal Jordan, Aquaman, and the Atom. So I could be a little off.
