As soon as it became official, those who’ve been around Aaron Glenn for years and know him best rejoiced the way they believe Jets fans should, celebrating him being hired as the 19th full-time head coach in the franchise’s star-crossed history.

The only fly in the ointment with the hiring of Glenn, the only argument that this isn’t yet his time, is his lack of head coaching experience. And that was aggressively sH๏τ down by those who know him best.

“What supersedes [lack of experience] is … his knowledge about the New York fan base, New York ownership in the New York media,” former Jets cornerback Ray Mickens, Glenn’s best friend, told The Post. “You can have head coaching experience. That’s great, but you don’t have head coaching experience in New York. New York is a different beast. It’s just different.

“He’s gonna hit the ground running, man. I know you know one thing: He’s not going to celebrate.”