There is a very good chance he will be OK with a 1 year deal with enough of it baked in as a signing bonus. And of course the remainder would be guaranteed as of week 1. So he has little to lose unless he is really sure he will play more than 1 more year.
His terrible year is probably more on the OL and coaching than his age, but his age isn't going to improve. Hopefully the other 2 will. I would not put any star back behind this OL.