BOSTON: The Boston Celtics appointed 36-year-old Brad Stevens as coach on Wednesday, adopting a youthful presence on the sideline to match the younger profile on the court.

With aging stars Kevin Garnett and Paul Pierce traded away to the Brooklyn Nets, there is clearly a rebuilding phase in the playing group, and Stevens was hired from college team Butler to oversee it.

The move turns the tradition-bound franchise over to a mentor who is younger than Garnett and wasn’t yet born when Bill Russell won his 11th NBA championship in 1969 (or even when John Havlicek added two more in the 1970s). It’s the first time the Celtics have hired a college coach since Rick Pitino in 1997, and their first coach with no NBA experience of any kind since Alvin “Doggie” Julian gave way to Red Auerbach in 1950.

“Though he is young, I see Brad as a great leader who leads with impeccable character and a strong work ethic” Celtics general manager Danny Ainge said in a release. “His teams always play hard and execute on both ends of the court. Brad is a coach who has already enjoyed lots of success, and I look forward to working with him toward Banner 18.”

Stevens has spent the last six years as the coach of Butler, leading the Bulldogs to back-to-back national championship games in 2010 and ‘11. He has a career winning percentage of .772 and never won fewer than 22 games in a season.

He takes over a team that is three seasons removed from an appearance in the NBA finals; the Celtics won their unprecedented 17th championship in 2008. But with Garnett and Pierce showing signs of slowing down in this year’s playoffs, when Boston was eliminated by the New York Knicks in the first round, Ainge has decided to rebuild.

He allowed Rivers to take over the Clippers, extracting a first-round draft choice in return. Amid last week’s NBA draft, the Celtics and Nets agreed to a deal that would send Garnett and Pierce to Brooklyn in exchange for a package of players along with three first-round draft picks. Now, Stevens will be the one to work with those young players.

“Our family is thrilled for the opportunity given to us by the leadership of the Boston Celtics, but it is emotional to leave a place that we have called home for the past 13 years,” Stevens said in a release issued by the university. “We truly love Butler University and Indianapolis, and are very thankful to have had the opportunity to celebrate so many wonderful things together.”

Pacers sign draft pick,

free agent Donald Sloan

Meantime, Indiana signed first-round draft pick Solomon Hill and free-agent guard Donald Sloan on Wednesday.

The Pacers did not release terms.

Hill was a surprise choice at No. 23 overall in last week’s NBA draft. Most analysts did not believe the 6-foot-7 swingman from Arizona would be taken in the first round but the Pacers believe he’s a good fit in their system.

Sloan played in 23 games last season with Cleveland and New Orleans, averaging 3.5 points, 1.7 assists and 1.2 rebounds.

Since Larry Bird officially returned as president of basketball operations Monday, the Pacers have been busy. They hired Nate McMillan as associate head coach Monday, then announced their summer league roster. On Tuesday, they agreed to a three-year deal with starting power forward David West.