When does a comic book character count as an "Old" comic book character?

[neatoman]

About 15-20 years ago I thought of Spider-Man as an "old" comic book because he had been around for over 40 years. And the Wolfman Titans (Raven, Starfire and Cyborg) as not exactly recent but more contemporary creations, as they had barely even crossed the 20 year line. And something like Deadpool as recent because he was only then creeping up on a full decade.

Of course, it dawned on me that the Wolfman Titans turn 40 this year, meaning they would be old comic book book characters using that definition. And SPider-Man is, what? Really old at almost 60? And the TMNT will turn 40 in a couple of years as well.

I know it's ultimately always going to be an arbitrary number but is there a concensus for when a character is considered "old"? And yes, obviously a character like the Phantom will always be older than Spider-Man, but we don't think of people in 70's as young because people can live to be 120+.