He looks right on target for 15 weeks, to me. Their hair changes so often over the first year to year and a half, it is almost impossible to tell what type of coat he will have at this young age. You'll have a better idea around the 5 or 6 month mark.
I tell my girl that she is under achieving because most 1 year old's have tan/gold on their entire heads (or almost) - from the pics I see. She still has a lot of silver/gray. I think they all change at their own pace
