Short answer: memory foam lasts 8–10 years, innerspring 7–8, hybrid 7–9, and natural latex up to 12 — but the calendar matters less than the sag test. Press a broom handle across the mattress: if the surface dips more than 3 cm where you sleep, or you wake up with the same ache every morning that fades an hour after getting up, the mattress is done regardless of age. The average person keeps a mattress 9–10 years but should have replaced it around year 8 — sleep quality quietly decays a good 18 months before anyone connects the dots.
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Lifespan by type, with the fine print
| Type | Typical lifespan | Failure mode | Rotation |
|---|---|---|---|
| Memory foam | 8–10 years | Permanent body impressions | Rotate 180° every 3 months |
| Innerspring | 7–8 years | Squeaking, sagging coils | Rotate 180° every 3 months |
| Hybrid | 7–9 years | Foam layer compresses over springs | Rotate 180° every 3 months |
| Natural latex | 10–12 years | Slow firming, edge crumble | Rotate every 6 months |
Two variables move you off the chart: body weight (a 100 kg sleeper compresses foam roughly 30–40% faster than a 60 kg one) and the base. A mattress on proper slats spaced under 7 cm apart lives 1–2 years longer than the same mattress on a solid board or a worn-out frame — airflow keeps foam from cooking in its own humidity.
The sag test and the ache test
Three checks, five minutes, twice a year. One: lay a broom handle or a straight edge across the middle — a dip deeper than 3 cm is structural, not cosmetic. Two: check the edges; if sitting on the side dumps you toward the floor, the perimeter foam or border rods have gone, and that costs you a fifth of the usable surface. Three: the two-week hotel test — if you sleep markedly better anywhere that is not your bed, your bed is the problem, and no pillow purchase fixes it. Flipping is mostly obsolete (modern mattresses are one-sided), but rotating head-to-foot every 3 months evens out the impression zones and buys 6–12 months of life.
Warranty years are not lifespan years
A "10-year warranty" is not a 10-year promise of comfort — it is a promise against defects, with sag thresholds usually set at 3–5 cm and prorated value after the first years. Read: by year 6 a warranty claim on a £600 mattress may return £150. The warranty is a floor, not a schedule. What actually predicts replacement: sleep quality dip, visible sag, and the smell test — a mattress that has absorbed a decade of life is a mattress that no longer fully springs back when you press it.
The frame and slats are half the lifespan
A £900 mattress on a broken slat base performs like a £300 mattress. Check annually: slats present and uncracked (a missing centre slat under a couple's mattress can halve foam life by creating a valley), centre legs touching the floor (most queen-plus frames need a middle support rated for 150 kg+), and no side-to-side rocking. Replace the frame's weakest part and the mattress gets a genuine second wind — it is the cheapest sleep upgrade nobody advertises, because frames do not have marketing budgets.
Two people age a mattress faster than one
A shared mattress wears a valley where two bodies meet — the centre third takes double compression every night, which is why couples replace mattresses 1–2 years sooner than the solo-sleeper chart suggests. Rotating head-to-foot helps less for couples than for singles because both rotative ends get equal couple-load. The practical counters: choose a firmer tension than feels right in the showroom (it softens 15–20% in the first year under a couple's combined nightly load), check the sag test from each side of the bed separately, and if one partner outweighs the other by 25 kg or more, a mattress with zoned support (firmer centre third) holds its shape noticeably longer than a uniform foam one. The cheaper alternative — rotating every 2 months instead of 3 — costs nothing and measurably evens the valley.
Keep reading
More dimension guides are in the collection, and the full index is on the furnolio journal.
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