[Kip.The.Great]

Okay, that's a bit confusing! Yellow bird, yet blue!

And I'm sure they're both AT LEAST a year old now. Probably closer to 18 months.

Yellow and Blue makes Green right?
I think he's trying to say that the yellow and the blue, is making his sea foam green colour, even if he only has a small amount as blue, it is he's base colour.

Did you get them from a breeder or a pet store? How do you know he's exact age? Looks quite young to me too, but i'm no expert.