It's completely subjective. My personal definition is anything over 1 year is age. Anything under a year is rest. Every cigar is going to be different too. Some take years before they hit their prime, others only months. In general, the stronger the cigar the better it will hold up to aging, but there's a lot of variables so that's not always the case.
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we explored this idea in THIS THREAD a while ago. check it out and ask questions.