We're opening up the mailbag (JohnKaralis.com/mailbag) for a look at which Celtics can play deep into their 30's (aside from Al Horford, who is already doing it) and lessons learned from sticking with Jayson Tatum and Jaylen Brown. John Karalis of Boston Sports Journal gets into that and also answers questions about the Dallas Mavericks being overrated, Isaiah Thomas' time as a Celtic, moving the Maine Celtics to Massachusetts, superstitions, and more.

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