Well first it was petrov and now it's Carew, how come it's the same people who seem to focus on one player every so often?
Carew has been poor this season but was his other seasons he's been excellent. I don't get what his age has to do with things, yes it means he won't improve much as a player but that's not the problem, he is out of form, it's not like his legs have gone or can't physically handle it, he is in poor form and injuries have effected him this season.
I wouldn't be too quick to sell him in the summer unless he really wants to go.