As Bob mentioned above, all cigars will lose some of their "edge" with aging and become more rounded in profile. A harsh, strong cigar will become less so, etc.. Many say this is due to the "melding" of the various components of filler and binder/wrapper. Indeed cigars can go way past their prime as well.....I would sacrifice that Monte to the fire gods myself if I were you Don.
Additional aging is less beneficial for cigars of other than Cuban origin, in my experience. Aging is virtually required for cigars of Cuban origin, again in my experience. Cuban cigars will enter a "sick" period and release ammonia somewhere between 6 months to 1 year after they are produced and sold. Many boxes even suggest to smoke these cigars either within 6 months of purchase......or after 1 year from production. In the other cigar producing countries, double and even triple fermentation is common as is aging wrappers and even fillers for up to 5 years prior to rolling the cigars with an additional 60-180 days rest before boxing and selling. It is a fairly recent advent in Cuban cigar production to age wrappers on even their higher $$ lines for 3 years.....and the longest period of aging is 5 years for the Cohiba maduro wrappers iirc.
Hit up a cigar forum sometime and search for some threads on aging.....there will be many! As for me, I don't make a point to age anything not from Cuba....including my own tobacco, once it's rolled.