IDK, I think most fans would agree that - regardless of age - there's a vast difference between Wally and Barry and Hal and Kyle. That said, I've never minded legacy characters. I know one of DC's main beef with them is that they age the iconic one's (Batman especially), but if Keanu Reeves can still do everything he does in the John Wick movies at 56, there's no good reason Batman can't age past 40.