Aging tobaccos can be inconsistent in results. I've had five year old Penzance that lost a little depth of latakia flavor. I've also had 15 year old and seven year old Penzance that were terrific and lost virtually nothing. Last fall, I had some Balkan Sobranie from the early 1960s and late 1960s that was rich and deep in flavor. I also had some early 1980s St. Bruno that lost a little topping, but Sablebrush had some 1970s St. Bruno that didn't.
Early this year, I had some 1980s Nightcap that was duller than watching paint dry, and I had some 1990s Nightcap that lost virtually nothing. I've tried Edgeworth Ready Rubbed and Sir Walter Raleigh in every decade from WW2 until now (or in the case of ERR, 2010), and they all tasted the same, except the 1945 ERR seemed slightly deeper in flavor. Mid-1920s Half & Half and 1950s H&H both lost some topping, but the two versions from the 1970s did not.
I have found seven year old Tilbury, Dunbar, Telegraph Hill, Solani 633 and FVF gained some flavor depth and change. The Virginia in Tilbury was stronger than when fresh, the perique in Solani 633 seemed a little spicier, while the perique in Dunbar had soften a mite. Telegraph Hill had gained all the way around.
I have found that Louisiana Red, Anni Kake and Rolando's Own mellowed after five years. However, a couple years ago, I had some five year old Anni Kake that had lost virtually nothing.
I've had 1938 Capstan Blue that did not age well at all, but the 1940 version had mellowed a little, but still seemed similar to current versions.
This year, I had some 1938 F. And J. Smith Glasgow Smoking Mixture and 1960s Smoker's Haven #10 from freshly opened tins, and they were incredible experiences. The Syrian latakia from the SH #10 was so deep and rich that I could taste the Syrian on my lips and mouth for more than thirty minutes.
Others who have smoked aged blends know it's all a crap shoot. Sablebrush has a few stories of his own that he can tell, particularly with his recent purchases of Haddo's Delight.