Share 'old-timer or newbie?'

What are some of the ways you can tell if someone is new to the zine scene, or if they are a long-time zinester? (I ask in the spirit of good humor and silliness, not mean-spiritedness.) My example: Old-timers put anti-alien stickers (like below) on their envelopes, because they've had dozens of them hanging around since the mid-90s and they want to be rid of them.