5 Telltale Signs It's Time to Replace Your Mattress

3. Stains or Unpleasant Odor

This sign relates to cleanliness rather than comfort. If your mattress has visible stains, a musty smell, or resists freshening, it’s time to replace it. Over the years, mattresses absorb sweat, body oils, dead skin, dust, and other debris. While not necessarily unsafe, an old mattress becomes less hygienic and harder to keep feeling clean.