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#3 Boston Celtics (1968-69)
The late 1950s and 1960s were a period of utter dominance by the Boston Celtics, who won 11 titles in 13 seasons. Their final championship campaign of this run came in the 1968-69 season, where they won a grueling Finals series against the LA Lakers 4-3.
Despite winning the NBA title the previous campaign, the Celtics finished fourth in the Eastern Division, winning 48 of their 82 games. Future Hall of Fame inductees Bill Russell and Sam Jones were both over the age of 34 when the season began. Their fellow legends and stars of the team, Bailey Howell and John Havlicek, were over 28. The team had an average weighted age of 30.79 years.
Both Havlicek and Jones would score over 20 points per game in the playoffs, while Russell averaged an immense 20 rebounds along with ten points for good measure.
#2 Dallas Mavericks (2010-11)
For the second-oldest NBA champions, we have to go back only a few years to the 2010-11 Dallas Mavericks side led by Jason Kidd and Dirk Nowitzki.
They were both over the age of 33 when they lifted the Larry O'Brien trophy. Kidd was the elder statesman of the team, aged 37 when the season began. Shawn Marion and Jason Terry were both also older than 32. The team had a weighted age of 31.6 years.
The Mavs had been among the title favorites for some time before the 2010-11 season, reaching the playoffs each campaign since the turn of the century. They were still feeling the pain of their NBA Finals loss in 2006.
But they were able to avenge their defeat against the Miami Heat by beating their Eastern Conference opponents 4-2, with Nowitzki winning the Finals MVP award, averaging 26 points and 9.6 rebounds per game.
#1 Chicago Bulls (1997-98)
The 1997-98 season would be the final ride for the Chicago Bulls' dynasty. After sealing another three-peat, Michael Jordan, Scottie Pippen and Dennis Rodman would all move on, as too would Steve Kerr and Luc Longley.
By the time the postseason came around, eleven of the Bulls' roster were over the age of 30, with the weighted age of the side just over 32 years. However, the team were carried by their star trio, who all had immense durability, having continuously made deep runs in the playoffs throughout the 90s.
Dennis Rodman was the team's oldest player at 37, though he played 80 games during the campaign and every postseason matchup. He registered a defensive rating of 100 in the playoffs and grabbed 11.8 rebounds per game.
Michael Jordan, aged 35 by the end of the season, became the league's oldest scoring champion after averaging 28.7 points per game. Although he didn't quite have the athletic prowess he once had, Jordan still put up a staggering 32.4 points each night in the playoffs.
His time with the Bulls culminated in a fitting 45-point domination against the Utah Jazz in game six of the NBA Finals in which he sealed his sixth championship with a 17-foot game-winner.
