Generally yes, an unopened eau de parfum tends to hold up slightly longer in storage than an unopened eau de toilette, mainly because its higher concentration of fragrance oil relative to alcohol gives it a bit more resilience against the slow chemical changes that occur over years, even sealed.

Why concentration affects shelf life too

As covered in our answer on how long unopened perfume lasts, storage conditions matter more than concentration for an unopened bottle, but concentration isn’t irrelevant. Eau de toilette contains a higher proportion of alcohol relative to fragrance oil, and while alcohol itself is stable, the lighter overall fragrance load means there’s simply less aromatic material to buffer against slow degradation over years. Eau de parfum’s richer oil content tends to age a touch more gracefully, similar to how a fuller-bodied wine can sometimes hold its character longer than a very light one.

The difference is genuinely modest though, both will keep for years if stored properly, cool, dark, and undisturbed, and poor storage will degrade even the richest parfum faster than good storage will preserve a delicate eau de toilette. Our how to store perfume guide covers the practical side of this, and the complete guide to perfume explains concentration differences fully. In either case, storage conditions will always matter more than concentration alone, so a well-kept eau de toilette can easily outlast a badly stored parfum.