"I'm done," Bush said. "Yeah, I'm done. I said it. It's not breaking news. I've been saying it. I said it all season long, I said, 'Listen, if I don't play this year, I'm going to retire.' Because I'm not going to spend a whole year off, come back, 33 years old, trying to get back in the league. Listen, once you get to a certain age as a running back, they just start to slowly weed you out."