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[–] Myrv 0 points 1 point (+1|-0) ago 

If we take the definition that matter is any particle with a non-zero rest mass then no, not all matter is the age of the universe. Matter can be created from photons (which given the non-zero rest mass condition are not matter). That said, what percentage of the the universe is new matter? I'm not sure but I guessing an infinitesimal small amount.