For me, I find Wheats are best in the range of 2 weeks and start to diminish after 2 months. IPA's are best 1 to 3 months. Stouts, porters, dark specialties all get better with age. I made a holiday spiced porter 18 months ago that gets better everytime I have one. Basically, each style has a different condition time that's optimal. Just experiment and find your preferences for each.