according to Creed house, the more natural ingredient based perfumes are the better they age (provided kept in good conditions - in box no light or extreme temps).
just make sure you only buy non evaporated and sealed vintage perfume!! - one exception most Arpege vintages seem to turn rancid with age. in boxes sealed quality perfumes can last up to 20-30 years.
I bought sealed Joy, Mitsouko, 1000, Normandie (edt), Vol de Nuit extraits de parfum vintages and all are way more beautiful than the "new" ones wich I have too - huge difference btwn new and vintage Mitsouko extrait - the new one is harsher, greener with a stronger synthetic tar note, the vintage is creamier, earthier, darker but luminous, just feels more multi-dimensional.