Just give him some help bro:tongue_smile: . I would recommend getting the Sennheiser Momentum or the Hifiman HE-400.
My quip about audiophiles being born is not just philosophical nonsense. I didn't chose to be an audiophile - I just wanted something that sounded better, then better, then better, then better, and now I have a over-sized collection of headphones and equipment that forced me to have an interest in this stuff otherwise I would still be stuck with cheap earbuds and I would never enjoy music.
If you really are 13, and you can afford an HE-400, then it doesn't entirely matter what headphone you get now - if you don't like it you can just sell it and find one you like better... you've got a long lifetime of happy audio ahead of you
. That said, you can't really go wrong with the HE-400. I've only just stepped into the world of orthodynamics (vintage 70's stuff) and I'm absolutely in love with it...... my only advice is that as a 13 year old you should steer clear of bright headphones - your hearing is more sensitive to higher frequencies than most of us older folk, so you will find bright headphones like Grados unbearably harsh and piercing and you won't enjoy the music. Orthos tend to be softer in the highs than dynamics.
Also, is the PA2V2 strong enough to power those orthos? Modern orthos should have better designs and be more sensitive than older ones, but my PA2V2 sometimes isn't quite enough for my two orthos (which are 50 ohms and 30 ohms). The sensitivity of the HE-400 is a little low at 92dB - although in the real world this doesn't mean much until you actually plug it into the amp and have a listen. I think the sennHD800 for example is around 90dB, but my PA2V2 was fine with that.