Such a sweetie pie! I wish I got my Pancho when he was that young, I didn't get him until he was a little over a year or so. We just know his birth year, not his actual hatch date. So when do WC stop getting more white?
I believe they can continue to get more white throughout their whole lives. I've noticed Olive's white cap "growing" since I got her in February. Obviously, it's not as dramatic as it is during their first molt but I notice it. She's getting more white around her eyes, for example. I'm not sure if it's related to improving her diet, age, or what.
You can see in my siggy: Left is right after I got her, right is a few months later after a molt, and the pic I'm attaching was this weekend.
Before the white didn't touch her eye ring or come around the side of her cere but now it does.