If we're talking over the hill in terms of to old it's not the team, it's just Pierce and Garnett. That's not a slight to them, it's pretty amazing that they're still playing at such a high level considering they're age(Mid 30s = NBA retirement age). I have no doubt this team will post a solid record and make the play-offs, but to contend we need another all-star. We need a guy who can put up similar numbers as Pierce and Garnett to help off-set their decline.
Rondo won't do?
No.
We need another all-star in addition to what we already have.
Ah, we need four all-star caliber players to be a contender?
I think it's getting to the point where you might be able to have a good argument about whether or not Pierce and KG are really All-Star caliber players on a nightly basis.
Not saying they aren't, necessarily, but it's getting close. Admittedly with KG I think it's mainly that he's playing 28 minutes a night.
Eastern All-Stars:
G - Rondo / Holiday / Lowry
G - Wade / D-Will
F - LeBron / Pierce
F - Melo / West / Garnett
B - Varejao / Bosh / Chandler
Pierce gets on there mainly because the SF position is pretty weak league-wide this year. You've got LeBron, Durant, Melo, and then a handful of guys who are pretty good -- Pierce is at the head of that second group. That's about it.
Garnett is a borderline add among the "big man" group, competing with guys like Joakim Noah, Al Horford, and Brook Lopez.