Ok, if I am seeing things right, I will have eye surgery in 3 weeks, not reliable right now, seems that only his two year old incisors are in.
That would mean the next two should shed and permanent ones come in this summer/fall, indicating he is three now, the last two next summer as he turns four?
Ask your vet?
He is a very regal looking horse, bet his disposition will also be calm.
You both will have a great time forward.