Is your 12 year old strong enough to handle a spunky pony? He looks like he is quite energetic and maybe a bit headstrong? Plus, he looks really fast going through those fences. I thought hunters were supposed to be slow and collected? (I'm not a jumper so I don't know for sure) But he looks like he could win a speed jumping round.
I think he is cute though. He's got a nice trot. Doesn't look choppy. His canter looks okay, not as sweepy as his trot but definitely not the worst that I've seen. To me, it looks like he has a nice jump. But like I said, I'm not a jumper.