Most people say icelandics mature later and shouldn't be ridden at all untill they're 4-5.. but concidering that all horses, skeleton wise, mature at the same age I don't really buy that. I just think it's a cultural thing; if you have a herd of hundred or more semi wild horses, why hurry to start them at 3?
Anyway.. I'm not really for starting a horse under saddle too early, but I think that if I sit on him now and walk him a bit (maybe 3-10 minutes every second day or so) before he goes into the next growth period, then he'll have something to think about untill next time when he's filled out more and such. And I think a slight training now will make him grow stronger too.
He's been really good this far, stands quietly when I crawl up on his back and everything. No bucks, nothing. He tries to eat grass *lol* but that's all. He's started to respond to the cues for going forward (he has been pulling a cart before but I don't feel experienced enough to drive him alone and I don't have anyone who is experienced enough that can come often enough to keep him up to date on it). He responds great on steering with my legs and I'm proud of him.
Also, since I started sitting on him, he has started to come up to me in the pasture instead of just waiting for me to get to him. Even left the other two horses at times. :)
But what do you think, am I rushing things too much, riding him before he's 3 years old? It's not like I must do it, I have another horse to train, but I want to.. He's quite even in his body right now but I believe he'll fill out more soon and perhaps get a bit taller too.,.