As of November 29, 2009, Wall-e is old enough to trial, since he turned 18 months old on that date.
I've been asked quite a few times when Wall-e is going to start trialing :) The answer is...well, I don't really know! I do know that I'd like him to gain some more drive before trialing him. His focus is definitely good enough for a trial, though, he has awesome focus!! (maybe even too much, at times :) he needs a bit more obstacle focus)
He hasn't tried running a full course yet, although I'm sure that he could run a Starters Jumpers course clean and probably an Advanced Jumpers, too. His dog walk and A-frame training hasn't been completed yet, so it'll be a while before he could run any courses with contacts.
I like taking it slow with my dogs when it comes to trialing. I didn't trial Mika until she was 3 years old even though we'd been doing agility since she was 11 months. I might end up trialing Wall-e in 2011, when I'm 110% sure that he's ready!