The lifespan of a memory foam pillow depends on how it is cared for. A quality memory foam pillow should last 5-7 years with proper usage and care. It's important to rotate the pillow every few months, avoid flipping it over, and use a pillow protector so that sweat, hair oils, lotions, and dust do not get embedded in the foam. Additionally, storing in a cool place such as a closet can help extend its life and keep it soft and supportive over time.