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Aromatic tobaccos may or may not age, depending on the base tobaccos, and how they were flavored. Casing can kill the fauna that are responsible for the early phases of aging, so Captain Black, in all probability, will not age.
GL Pease, 2001-04-04
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Since mass-market styled aromatics use low character base tobaccos and spray their top note or sweeteners, these tobaccos will actually decline in character over time. Heavy cased aromatics, both in bulk form and in packed form (pouch or tin) should be used "fresh" and not left to cellar. True cavendish processed aromatics, usually Danish produced, can be smoked now, but will continue to improve over a period of time of up to a year. After the first year little additional change will occur in the base tobacco of Danish Cavendish, although the flavor, sweetness and character will "hold" for several additional years under proper storage conditions.
R.C. Hamlin, 1995 Pipes Digest
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The real problem, I believe, is that a majority of heavily sugared and sauced aromatics rely almost exclusively on the additives to provide flavour, using the lower grades of tobacco to simply carry the flavourings to the smoker, and provide some nicotine for body and "strength." These lower grades of leaf do not benefit from age. To cite the wine metaphor once more, no amount of aging will make a bottle of plonk anything more than old plonk, while a bottle of a grand cru will develop much of its complexity and bouquet only after years of bottle age.
It is not the fermentation, or cessation of fermentation through a hostile environment which produces the bad taste found in the tobacco equivalent of "old plonk." There is a difference between aged tobacco, and tobacco which has just gone stale, and that difference starts long before the aging process has worked its magic.
GL Pease, 1999-02-08