You should usually buy a new mattress about every 7–10 years, but the real answer is: replace it as soon as it stops giving you comfortable, pain‑free, hygienic sleep.

Quick Scoop

  • Most people are told to replace a mattress roughly every 6–10 years , depending on quality and use.
  • Higher‑quality or latex mattresses can last longer (often up to 12–15 years) if well cared for.
  • Your body is the best judge: if you wake up sore, see sagging, or sleep better elsewhere, it is time—no matter the age.

Typical replacement timelines

  • Foam or hybrid mattresses: often around 7–10 years before support noticeably declines.
  • Innerspring mattresses: commonly closer to 6–8 years because coils wear and sag faster.
  • Latex mattresses: can stay supportive for a decade or more, sometimes up to around 15 years with proper care.

Signs you need a new one

  • Visible dips, lumps, or sagging where you lie, even after rotating it.
  • You wake up with stiffness, new aches, or more back/neck pain than you went to bed with.
  • You sleep better in a hotel or on a guest bed than on your own mattress at home.

How to make it last longer

  • Use a snug, good‑quality mattress protector to guard against sweat, dust, and spills.
  • Rotate the mattress every few months (or as the brand recommends) so one side does not wear out faster.
  • Keep it on a supportive frame or foundation so it does not bow or sag in the middle over time.

Real‑world & “trending topic” angle

  • Many people quietly keep mattresses 12–15+ years and only replace them when sleep is clearly suffering or a partner complains.
  • Recent sleep‑health advice online leans toward being a bit more proactive: checking in around the 7–8 year mark, especially if your life, weight, or health has changed since you bought it.

TL;DR: If you are wondering “how often should you buy a new mattress?” and yours is over about 7–10 years old or already feels uncomfortable, that question itself is often the first sign it is time to start shopping.

Information gathered from public forums or data available on the internet and portrayed here.