According to nba.com the OKC Thunder is the 2nd youngest team in the NBA and the 30th team in terms of playing experience.

Even though experience and age usually determine how well a team does, there have been times when young and energetic teams, without too much pressure to perform, surprised everyone by doing better than expected. It’s like having a group of talented players who really want to show what they can do, and they can play freely without worrying too much about big expectations.