People who are saying it's because we're too old, quite frankly have no idea what they're talking about.
Age hasn't made Rondo walk the ball up the court so the defense gets set and forces us to take bad midrange contested fadaway jumpers 10+ times a game.
Age hasn't made Green a "here and there", "sometimes" player.
Age hasn't made Rondo a sieve on defense who lets guys blow by him to the rim.
Age hasn't made us have players walk back in transition defense while they play 4 vs 2.
It's laziness, self entitlement and sheer stupidity of Rondo. I mean yes, you can argue if Pierce and KG were in their primes we'd be better (stating the obvious). But this team's talent, even with PP and KG at this point in their careers is WAY higher than what our record shows.
Lack of a quality center to spell Garnett coupled with Pierces legs finally giving out after Doc was forced to ride him all season, all topped with laziness and self entitlement given by everyone on the team besides Garnett and Lee. Those are the things that have caused this season.