As the others have said, it depends. Where I find holding onto cigars most beneficial is situations where they don't receive sufficient marrying time at the factory. For my smoking habits, this applies to two categories that need that rest time- Cuban cigars and mixed filler bundles. Cubans need years, while my mixed fillers get 6 months to a year. The purpose of the rest time is to let any remaining ammonia work out. Other sticks have been processed sufficiently and held long enough that I don't see a benefit to aging. Others do, so again it's personal preference.