Light colored beers and wheat beers tend not to age well and are best drunk young. Most hoppy beers are the same, because the hop flavor/aroma fades over time. Darker beers and higher-alcohol beers tend to do best at long aging. I'm sure some folks who have more experience will be able to come up with exceptions to this, but from what I understand, this is a good general guide.
"You never can tell with bees." --Winnie the Pooh