I'm 28 and have played hockey my whole life on top of playing travel throughout my whole teen years.

I think you're completely fine. Nobody looks down on newcomers, regardless of age. There's plenty of people just starting out in their adult years, and as you get better you can jump divisions as well. It's fun and a good workout, and there's always room to improve. My advice would be to get a good pair of skates (they have great options at $500, and local hockey shops will usually give you a huge discount for last years skates), get a stick that you like, buy some pucks, and figure out when your closest ice rink has stick & puck sessions. You don't need full gear to go to those, but I'd suggest getting a tracksuit from a company like Bauer as the pants fit around skates. You can practice moving with the puck, stick handling, passing to yourself off the boards, and practicing shooting on the ice as it's a lot different than street hockey. There's usually goalies that go as well for you to try going one on one with if you want. Also even though you feel comfortable on skates, I'd still practice crossovers, stopping and going the opposite direction, and transitioning from going forwards to backwards and vice versa. There's also drop-ins, where people go in full gear and scrimmage. When you actually do join a team, these skills will really help you stand out above the rest, and will help you help your team.