Discount or no discount, a mattress is only worth the investment if you need one. Mattress life span depends on the type and can range from 10 to 25 years.
However, a 2021 study found that — over a period of 5 months — participants reported more frequent low back pain if they were sleeping on a firm or foam mattress for more than 3 years.
If you're experiencing pain or difficulty sleeping, it could be a sign it's time for a new mattress. But always consult with a doctor to rule out any potential underlying health conditions.