Longevity refers to the lifespan of a fragrance; how long the aroma lasts before dying out. Some fragrances last more than others, and certain scents can add longevity to compositions that would otherwise be unable to last very long without such an addition.

Sandalwood and musk, are notorious examples of fragrances that are both longevous in their own right, and possess the ability to boost the longevity of the compositions they are added to.