Ageing pipe tobacco?

First let me say that I am some what new to pipe smoking and have a question. I am vary familiar with cigar smoking. I have been smoking cigars for twenty years and am very experienced with cigar ageing especially cuban cigars which get better with age to a point.

I have read that our friends in DC are considering raising the taxes on pipe tobacco by a couple of hundred percent. My first thought is to stock up on my favorites. So far I have only smoked fresh tobacco.

So my question is what happens to pipe tobacco when it ages? Does it get stronger and more complex like cuban cigars or does it lose flavor and strength? Is it a good idea to buy now before they tax it to the point that I have to rob the local bank to afford it or is the best pipe tobacco the latest release?