Tom Brady posted an Instagram message yesterday (January 8th) that seems to indicate he's not ready to retire, saying in the message to fans, "I still have more to prove." The 42-year-old quarterback wrote days after his New England Patriots lost their wild card game to the Tennessee Titans: "In both life and football, failure is inevitable. You don't always win. You can, however, learn from that failure, pick yourself up with great enthusiasm, and place yourself in the arena again. If Brady does plays next year, though, it's not known if it'll be the Patriots. His contract is up in March and he could become an unrestricted free agent for the first time in his career.