Fragrances can last quite awhile depending on the quality. Â Mass market stuff at EDC/EDT strength may only last 3-5 years, millesimes by Creed can last many decades. Â If you visit Creed's boutique in Paris, they have some vintage Creeds from the 19th century that are still quite nice. Â Fragrances, like wines, last longer if stored in the dark and in cool temperatures. Â All of my stuff is more or less 1-2 years old or newer as I keep rotating fragrances in and out of my collection and sell quite a few as well (on ebay and in other places)
Given that you mentionned having several hundreds of fragrances, and that there are only 350 days in a year, I was just a little worried for your collection. I spent a few days in Grasse, and yes, I have smelled perfumes that were several decades old with still quite a kick. However, some years ago, I found a forgotten bottle of Magie Noire in a drawer. I would estimate it was 15-20 years old. It was no longer wearable. So what do you think of this trend in Paris that has people designing their own perfume? Strikes me as Disneyland-y. But then again, when you smell some of the "creations" on the market, it makes you ponder.