Mattresses are expensive, so, understandably, you’d want to avoid getting a new one and would rather use a mattress topper. However, toppers are only a temporary solution. They work well if your bed is the wrong firmness for you or if you’re looking for a little extra comfort—without a super high price tag.
If your mattress is between 7 to 10 years old, lumpy, yellowing, or sagging, a topper can only do so much in terms of adding support and comfort and you may need to invest in a new mattress.