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Out of the four teams left in the conference finals, three of these teams will be around for a very long time. The exception of course is Dallas who won their title this year.
The Chicago Bulls' core of Rose, Deng, Boozer and Noah has an average age of 25.8 years. The Bulls' 10-man rotation that they run out has an average age of 26.6 years. The most important number is that their MVP is only 22 years old. Chicago could run out this roster and be elite or better for at least five more years without having to retool at all. They'll be around for a while.
The Miami Heat obviously have a pretty decent core made up of the best small forward in the league, LeBron James, the best shooting guard in the league, Dwyane Wade, and a top-five power forward, Chris Bosh. While they shrunk in the NBA Finals this year, they are a team that will be around for a while.
The Oklahoma City Thunder appear poised to take control of the Western Conference for the next decade. Their core of Durant, Westbrook, Harden, Perkins and Ibaka has a ridiculous average age of 22.4 years. While I don't know whether they will ever be good enough to win multiple titles against the likes of Chicago and Miami out of the East, the Thunder will have a stranglehold on the Western Conference for years to come.
With the exception of Dirk, the young guns started to take control of the league.