Depending on the style of beer, Christmas may well be too long to age. Most beers brewed with an OG of less than 1.060 are best drunk about 1.5-3 months after they are made in my experience. After that, you start to lose some of the fresh qualities of the hops and malt.
Now, if you make a special Christmas brew like a barleywine or Imperial Stout, then it may well still be green by Christmas. Even a really huge IPA could last that long, but in general, 9 months is a bit long to age homebrew. Beer is best served fresh (after allowing it to finish completely...say 6 weeks or so).