Months before Rob turns 30 he has decided to retire. This was a big topic of discussion heading into last season so this isn't big of a surprise.
He's got his health, tons of money and a lot of championships so why not?
Rob gets a rap for being dumb, however, I just think he's a fun guy that enjoys himself. To give you an example, he didn't spend a single cent of his football money until recently when he bought some jewelry. He had only been spending his endorsement money and saving the rest. That says something about his intelligence in my opinion.
He's set for life even if he doesn't work a single day again. He's done some commercials for Tide and other products so maybe he continues doing that or some acting. Maybe some announcing. Who knows, but I'm sure he'll have fun with whatever it is he does next.