I have found that different cigars respond differently to aging. Some seem to come to a flavor peak, while others mellow, some lose it. I had some Camacho SLR Maduros that were a year old when I bought the box, but they didn't come to perfectness (okay it's not a real word) till the last few that had sat in my humidor for 14 months. Some of the milder ones like Lusitania need at least three months in the humi to develope a decent potential. It is my experience that stronger tobaccos like Nicaraguan or Honduran just get better the longer you give them.
I usually buy two or three of a new cigar to age them as I smoke them. The first within a week or two. The second a couple months later. And the third (if I bought three) at about the six month time line. I have bought some cigars that were a really good deal only to find they tasted awfull the next day, but a yaer later - a decent smoke.