I really hope he stays. He might be 32, but he hasn't slowed down at all, and he can still run up and down the right side without showing signs of being tired even at this point in the season. He was one of our most energetic players at the end of the game yesterday. Notice how we never worry about him needing rest to avoid injuries, he's just always there - doing his job and running his legs off game after game...
Said it before in here, but all 32 year olds are not made equal, so I wouldn't use that as an argument against keeping him. I think Alves can have several good years left in him if he can keep his mind in the game and stay motivated like he is now. This could be a worry after potentially winning the treble, yet it's also entirely possible that he keeps this level of dedication up going into the next season and the one after that as well...
[MENTION=12906]DonAndres[/MENTION] is entirely right in saying that there are simply no other RBs out there who can match Alves when he's in form and playing at this level. He's basically our perfect player for the position when he plays like this, and that's worth quite a lot seeing how important fullbacks are to our game.