Rites of passage

Mo is going to be a teenager just after the new year.

We don't belong to a "tribe" of any sort but I've still been reading up on rites of passage. I don't want to endanger his life but I would like to do something symbolic -- or give something symbolic -- something that acknowledges that he's getting older and getting older means.... something.

Thankfully his fascination with guns has dissipated, so I'm not even thinking in that direction. (Sorry David, et al.)

He's thinking "fancy name brand smartphone" and while there is a certain kind of 21st century symbolism with that it really feels, I don't know -- commonplace?

The only thing I've really come up with is doing something to the stick we have measured him against every year on his birthday since he came to live with us. He outgrew it this year and it was kind of a big deal for him. I've thought about looking for an artist/craftsman/woodworker who could do something special with it. I have no idea of how I'd go about finding such a person but I think it could be done.

Does that sound cool-ish?

Did your family have any rituals for entering teenagerhood that I could riff on?

Thanks!