Well I had a similar experience few weeks ago...
I found a half full tin of Earl Grey from Taylors of Harrogate in my closet (for those of you who are about to say: "Boooo, mass-market dust-tea..." please don't
), that has been untouched for about a year, +/- 1 month. That tin is (as we all know) not realy airtight.
I peeked inside, and the smell was kind of different than expected. It was clearly bergamot - but far away from strong "dishwasher detergent" that it used to be when freshly opened. It has faded to something I can only call "more natural"
Next I emptied the contents of the tin spoon by spoon through a semi-fine mesh, and got rid of all "smaller components" of this tea. (about 5% to 10%)
And then I took some time to brew a few cups - and was quite amazed!
This Earl Grey was EXQUISITE - and I am talking one of the best I have tried!
Usually I would brew E.G. in a yixing pot (I have one specially for my earl grey teas) - but this one surprised me - it tasted even better from a glass (!) teapot. Clay tends to "round" the taste a bit, but since this "aged" tea was already a little faded, the glass preserved all of its (complex in a new way) character... and judging by the taste - that was obviously a very good thing.
(just for info: I always drink E.G. teas with about a teaspoon of raw (brown) sugar and 10 to 15 droplets of juice from a fresh lemon)
Quite a pleasant surprise, I must say... I would never have guessed this outcome