Oh my, he is a darling sky blue greywing. Those baby eyes kill me! I have a boy very similar but he is also faintly opaline too. Here is a pic of him at about 9 weeks. His cere was more pink purple then but I think your darling is a boy too.
Do I see a hint of a dark tip to his beak? If so then he is around 8-10 weeks. He looks young, less than 3-4 months. Greywings have such faint forehead bars it is harder to tell. You will know when he starts his first molt. He should be 3-4 months at that point.