I have competed at POYS a few times, I did the 148cm JA class in 2004 and it scared me to death!!! LOL I could walk under the jumps and so could my pony!!! I think the 128cm's are most impressive as their rider's are soo tiny!!! I can't remember ever being that small!! I think the youngest rider this year was Pippa Allen's sister who was only 5 and her pony was only 11.2hh!!! She just held onto its mane and it seemed to know it's way round!!! I think it was PA's sister?? Can't remember, they did announce it!!!
Milllie has been competing since she was about 6yo (think she's 8/9yo now but not very tall). We were at a junior BSJA show recently and I overheard one mother tell another that little "Chelsea" was at her first "away show" and she was just turned 6yo! That said, our youngest looks like he'll be a bit like that too - but maybe not if his section A has anything to do with it!