Perfume, like other cosmetics, has a shelf life, though it varies based on its composition and storage conditions. According to Kelly Kussman, founder of Cayla Gray, the most noticeable sign of expired perfume is a change in scent, often becoming sharp, sour, or metallic. While citrus-based fragrances tend to degrade faster, heavier scents like musk and vanilla can last for decades if stored properly. To maximize the lifespan of your perfumes, it is crucial to keep them away from direct sunlight and fluctuating temperatures, ideally in a cool, dark place. Some experts even recommend storing perfumes in the fridge to slow down molecule breakdown. Regular use is encouraged, as it prevents oxidation from air exposure; however, if a fragrance causes skin irritation or smells off, it should be discarded. Ultimately, while it’s disappointing that perfumes can expire, proper care and frequent use can keep them fresh for longer, allowing you to enjoy your favorite scents more often.