Yes, the beer will continue to age and mature in the fridge, but maybe not as well as if you cellered it and let the beer mature naturally. Cold temps will stop certain work the yeast and beer is going thru. From everything I've read and heard, aging beer by cellering (storing in a cool dry 60-65 degrees) is prefered to keeping it in a fridge for extended periods of time... I store mine in the coolest part of the garage, protected from sunlight and moisture, and put se on the fridge a day or two before I drink them.