do memory foam/latex mattresses loose firmness over a couple years like the pillows do of similar material??

I am thinking of investing in a memory foam/latex mattress but am reluctant as to if it will keep the ‘like new’ feel. I have gone through 2 memory foam pillows in 1.5 years because they loose support. now I have to turn the pillows on end to get any supprt. Do the matresses hold up????


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