It totally depends on the house.
When I was an undergrad, we had a late-20s/early-30s guy come through rush. Had he been 18-22, he most definitely would have received a bid, but for some reason our chapter decided not to extend one to him.
Should you decide to go for it, I hope you have better luck than this guy did. If it works out, great. If not, that's fine, too.