If you put straight VA or a blend with significant VA, or some Orientals, that you more than usual sugar, in an airtight container in a temperature controlled room, and wait for two years, 5, 10, etc., you are more than likely going to get a treat. But there are as good arguments for smoking it fresh as there are for aging.
The work of aging is the waiting and non-opening. A lot of smokers feel there is no harm in sneaking a bowl as desired. No one really knows if closed jars all the way is any better than periodic opening, but to me it makes no sense forcing the tobacco through successive iterations of upshifting into aerobic and downshifting into anaerobic fermentation. Left unopened, as most aging vessels that come down to us are, it will begin as aerobic and become anaerobic and stay in that phase. That is nature's course for tobacco fermentation in a closed container. If allowed to remain closed, the chemical/biological processes going on in that jar have taken time to develop, and that's what you put the tobacco in the jar to do. Yes? If it's humming along doing what you wanted it to do, why disturb it? I don't have any way of knowing this, but I would wager that on resealing the jar, those processes, although they will restart and will constitute true aging once again, cannot be exactly replicated. I don't believe that fermentation processes A-N before the jar was opened are merely interrupted, and once restarted all resume or all resume in the same way.
What would you say to a vintage tobacco that the seller says is 20 years old but that had been opened a dozen times? If I paid a premium price for vintage tobacco, it would be for something that was out of production or that I thought had probably aged well. Guarding against adulterated is the chief reason to require vintage containers to have remained closed, which is different than sneaking a bowl now and then from a jar that was sealed; as the manager of that jar you know that only air got in before you resealed it.
But again, if you are willing to do the work of aging, waiting, then wait. Why interrupt what is working? Why take a chance that the wait won't be worth it, or not as worth it. But no one knows, and given a tin of Old Gowrie that has been aged unopened for 10 years and another opened five times, aged for the same length of time, though I might be able to tell the difference, I doubt I'd prefer the unopened, or if I did, be able to say why. If you on the other hand had a preference and could be specific about why you preferred it, we could explain the difference as stemming from our unique palates. Between the science that I'm told is beyond understanding, nonetheless attempting to track the life processes of aging, and the world of subjectivity that ensues once the smoke is tasted, in the complex process of taste buds, thalamus and gustatory cortex, what we term the palate, you would have to dedicate a corporate division to track all of this; and in the end it would still be beyond explanation, because as yet science is not that smart.
When I read that VA blends, or blends that are part VA, as well as some Orientals, age well because of the sugar content, I immediately think of sugar as the fuel for aging. Today when I tried to get verification, I couldn't find it. It's everywhere that fermentation needs sugar, but not why.