No, it will not change. If anything it will get lighter. Buff, that is an even shade ALL OVER, is a very hard to breed color. Is Buffy a hatchery bird, or a breeder bird? The breeder birds tend to be a more even color. You are shooting for an all over color, the shade of a gold watch, an 18 K one! She is cute though.My buff is really golden yellow does their color mellow as they age?