I know I'm not allowed to judge anyone for sartorial choices but:
Ripcurl, Billabong, Quiksilver and so on. There are quite a few thirty-somethings I know who dress almost exclusively in this gear.
Same goes for 'snowboarders.' They have probably snowboarded once and yet they keep the board on display at home so that people ask.
One guy's house party i went to revealed a sunglasses case. As in a full rack of Oakley's et al.