How long does this mattress last, and does latex sag?

It is built to last, scoring a perfect 10/10 on durability with a 10-year warranty. The 4-inch organic latex comfort layer, where impressions normally form, is the longest-lasting comfort material made and resists the body-impression sag that ends cheaper foam beds, sitting over a stable open-cell bio-foam core. Keep it on solid, even support, rotate it head-to-foot occasionally, and use a protector, and it will hold its medium feel for many years.