Rodgers is only 31. Unless he gets a serious injury he can play another 5/6 years or more. He has less wear and tear than other guys his age because he sat on the bench behind #4 for a couple of years. Brady just won a ring at age 37.
We don't know what, if anything, TT has offered Cobb. There are reports out there that Ted offered him $8/9m but who knows if this is true besides those in the negotiations? I suspect a lot of this is just conjecture by reporters trying to fill space in their newspapers and blogs.