The short answer: it’s probably time for a new mattress if it sags or has body impressions that don’t recover, feels lumpy or uneven, makes noise when you move, or you regularly wake up less comfortable than when you went to bed, or sleep better somewhere else. There’s no fixed expiration date. How a mattress is built, how it’s used and how well it’s supported all affect how long it stays comfortable.
Mattresses wear out gradually, so the changes are easy to miss. You adjust a little at a time: a pillow under the knee here, a move to the other side of the bed there. Here are the signs worth paying attention to, and what to check before you replace anything.
Six signs your mattress is past its best
1. Sagging or body impressions
Some softening is normal as the comfort layers break in. But a dip that stays after you get up, or a valley in the middle of the bed where two people roll toward each other, is a sign the materials have worn down. To check, strip the bed and lay a long, straight edge (like a broom handle) across the mattress. Look for gaps underneath.
2. Lumps, soft spots or an uneven feel
Fillings can shift and clump over time, especially in pillow tops. If one area feels noticeably harder or softer than the rest, or you can feel individual springs, the mattress isn’t giving you even support anymore.
3. Noise when you move
Creaks, squeaks or a crunchy feel when you roll over usually point to worn springs or a tired foundation. Beyond being annoying, noise is often a sign of wear inside the mattress.
4. You wake up less comfortable than you went to bed
If you regularly wake up stiff or sore and it eases as the day goes on, your mattress may no longer suit you. A mattress isn’t a medical treatment, and pain can have many causes, so talk to your doctor about ongoing pain. But if you notice you feel better after a night on a hotel or guest bed, that’s a useful clue.
5. You sleep better somewhere else
A good night’s sleep on the couch, in a guest room or on vacation is a strong hint that your own bed has changed, or that your needs have.
6. Your life has changed
Sometimes the mattress is fine but no longer fits the situation:
- You now share the bed and need more room. Our mattress size chart compares the options.
- Your preferred sleep position has changed, so the feel that used to suit you doesn’t anymore. See mattress firmness by sleep position.
- You’d like to sit up in bed to read or watch TV, and an adjustable base would help.
- A child has outgrown a Twin, or a guest room bed gets more use than it used to.
How long should a mattress last?
You’ll see many rules of thumb, but there’s no single number that applies to every mattress. How long one stays comfortable depends on:
- Construction and materials. Different foams, coils and comfort layers wear at different rates.
- How it’s used. A guest bed used a few nights a year wears very differently from a bed two adults sleep on every night.
- Support underneath. A mattress on the right foundation or base, with proper center support, keeps its shape better.
- Care. Following the manufacturer’s care instructions and using a protector helps.
The better question isn’t “how old is it?” but “is it still comfortable and supportive for me?” If the signs above sound familiar, it’s worth trying something new.
Before you replace it: quick checks
- Check the support underneath. A sagging foundation, broken slats or a frame without a center leg can make a mattress feel worn when it isn’t.
- Rotate it, if the manufacturer recommends rotating. Some mattresses are designed to be rotated; many aren’t meant to be flipped. Follow the care label.
- Look at your pillow. A flat or lumpy pillow can make a decent mattress feel wrong.
- Use a protector. It won’t fix wear, but it helps keep your next mattress clean.
If the foundation turns out to be the problem, replacing just the support underneath may help for a while. But if the mattress itself has dips, lumps or worn springs, a new foundation won’t bring it back. That’s usually the point where a new mattress makes sense.
What to do with the old mattress
Getting rid of an old mattress is one of the biggest hassles of buying a new one. Mattresses are bulky, awkward to carry down stairs and often can’t just go out with the regular trash. When you buy from Mostly Mattresses, removal and disposal of your old mattress is free, along with free delivery and free in-home setup, so you don’t have to haul anything to the curb or borrow a truck.
Shopping for the next one
When you know it’s time, start with what you liked and didn’t like about the old mattress: too soft, too firm, too small, too noisy. Write it down; it’s the most useful information you can bring to a fitting. Then try a few options side by side. With our at-home fitting, we bring 3-4 hand-picked mattresses to your home, from good to better to best, at 30-70% off retail, and you test them in your own bedroom before you decide.
Take the Mattress Match quiz to tell us what you’re looking for, browse our mattresses, or book your free at-home fitting.
