Call me too much of a Boston Superfan but I think Tom Brady can play up to and past 40 years old like Brett Favre. The only major injury that he had was back in 2008 and it doesn’t look like he’s slowing down any time soon.
I say if he keeps himself healthy and has an offensive line that can hold him to being sacked no more than 1 time every other game it’s possible for him to play for another couple of years. It’s really all about the organization and system that he plays under. His career would’ve probably have been over by now if he played for the Raiders, Bucs, and Chargers.