>>112081349The ages don't really have a precise date, and GL/GA is considered one of if not the comic that kicked off the characteristics of the Bronze Age. In fact, I'd say John is a defining character of the Bronze Age.
It's certainly a valid idea that he's one of the last Silver Age characters, though, like how Martian Manhunter is kind of stuck between the end of the Golden Age and start of the Silver.
