My instructor is 22. I'm 54
He's a few years mature, and I'm several years immature, so we mesh well.
At 22 he doesn't have a ton of hours, and I asked him if he was looking to build and go fly with the airlines. He said not so much, but as we have gotten to know each other, I think he ultimately wants that.
I let him know up front I don't care. That is his path, and if he leaves I'll continue mine. We are not married.
I also told him upfront, I had zero experience, but if I do well, and can pass my checkride in 40 hrs, then don't hold me back. At the same time I made him promise he wouldn't let me fly without being 100% safe. He promised, and so far I believe him. He cut one of our flights short because of some lower clouds showing up, but I saw no reason to quit.
He was ready to solo me at about 12 hrs, and says I should be quite ready by 40 hrs.
Rumor is...one of the other young instructors (23 I think) has an IFR student with over 100 hrs of IFR training and he still has not signed off on them. I asked if he was milking it, but the response was, Nope.. he's just super cautious about his students.
My instructor has been pulled away a few times for flying an Embraer Phenom jet (for business), as he is only 1 of 2 qualified to fly it locally. This has caused a few roadbumps in our scheduling, especially with my work, weather, and family to boot...but I take those opportunities to study for the written, or anything else... and of course read the expert advice on this forum (mine notwithstanding).
I'm actually impressed by him, especially at his age. He is doing what he loves, having fun, and getting paid.
For now, I'm doing something I love, having fun, and he's getting paid
So I have to agree age shouldn't be a concern. Sort of like planes... try em out and see if you like em.