Most of what I've read says that Habanos SA does not age their tobacco before rolling. There is a little bit of aging before boxing, but that is not given any minimum time, in my understanding. This is the opposite of say a Padron Serie 1926. Those leaves have been aged a few years before rolling. Many other non-Cuban cigar companies do this as well. This then bodes the question, what cigars are good for aging?
When a cigar has been "Pre-aged," it is the general concensus (in what I've read) that more aging doesn't particularly help them. They may benefit from a couple more years, but will not have the staying power in a decade, because the leaves may be 13 to 15 years old at that time.
Generally, with Cuban cigars, they do not pre-age the tobacco. There have been a couple in the past, but it is not the general rule. As such, you have to let the leaves mature and finish curing. Smoking a really young cigar will generally create an ammonia flavor. That is the sick period. Habanos states that their cigars are ready to smoke the day they are shipped, and aging doesn't matter. Many do smoke very well right off the truck, but others will definitely benefit from some down time.
Getting past the sick period is one of those things that you just have to try a cigar every month or two until they are smoking good again. Unfortunately different blends, vitola, and marca all play into how long it will take. So do your personal taste preferences. 6 months to a year is a good rule of thumb if you ask me. Many people say 2 to 3 years minimum for most CC's though.