Z - our grown-up kiddo has an early January birthday as well, and I find it an amazing advantage in terms of gifts.
Anything I forgot to wrap for Chanukah or Christmas can come out two weeks later. Anything he wanted but didn't receive in December is now 40% off. And so on.
He also now wants to learn how to make all sorts of "mom dishes" from childhood and we never get around to them all during the holidays. So he enjoys being able to say, "I'll be back in two weeks!"