Conventional wisdom says Brad Stevens — tender by NBA head coaching standards at age 36 — is about to start leading men not much younger than himself.

But the new Celtics coach says he already has had that experience.

“I got the job when I was 30 at Butler and we had five seniors, and the average age was 23,” Stevens said earlier this week of his college experience. “It wasn’t that much different. One of the things that was really great back then is that those guys allowed us to coach them, even though we were younger. I had an assistant (Brandon Miller) who is now the head coach at Butler who was 28. Another assistant was 31.

“We were all young and just trying to find our way. They let us do that, and these guys have been great. I don’t expect it to be any different now. They want to win. They want to play well. They want to do well. They’ll see how much we’re investing in them and in the process, and I don’t anticipate it to be any different.”

President of basketball operations Danny Ainge has admitted the C’s roster is in flux. A new addition like Kris Humphries, and even an existing veteran like Brandon Bass, could as easily be on another team as remaining with this one by opening night. But as he showed with his visit to Rajon Rondo’s basketball camp last week, Stevens is anxious to learn from his veterans, whoever they may ultimately be.

“And I’ve been doing that my whole time in coaching,” Stevens said. “Great players teach you something every day, and it’s more important that the game tells them what to do than a coach tells them what to do. They can feel, read and understand a situation, and hopefully the coach is in a position where you’re not dictating, you’re empowering.

“The idea that those guys have been there, done that is a good thing. The fact that all four of those guys have had very productive times is a benefit. You look at Kris. He’s one of the better rebounders in the league when you do it on a percentage basis. MarShon (Brooks, who came over from the Brooklyn Nets with Humphries, Keith Bogans and Gerald Wallace in the Paul Pierce-Kevin Garnett-Jason Terry trade) had a year where he averaged double figures, and then a year where he didn’t play as much. He’s going to be excited to have an opportunity to contribute, and contribute in a bigger way. You have a guy like Keith who has been a locker-room leader who has also been a starter on teams that have advanced in the playoffs and done really well. And then there’s a guy like Gerald who’s shown the league what he can do from a versatility and athletic standpoint.”

Stevens is glad to simply absorb this kind of experience for the moment. There will be plenty of time for other issues, like developing a rotation, once the Celtics roster is eventually set.

“I can’t even think about something like minutes right now,” he said. “Let’s see what we have, and then we can move on from there.”