I want to keep Ray Allen until he is 40. He will never stop hitting clutch 3's and clutch foul shots.
I am not buying into the whole 'break up B3' before their contracts run out. If we win 2 or 3 titles in the next 4 years, we should attempt to re-sign each one of them at more modest contracts, and keep it going.
Their body types, (lack of) injury history, and the individual games of each - all are in their favor of playing at a high level into their late 30s.