Since a human is not created until it is conceived, the building blocks of a human do not exist before one is created. Matter is ~13.8 billion years old and is simply rearranged through time. Humans are organisms created from cells, which are created from matter. A human is the name given to a specific structure of matter, and is only as old as when that matter was rearranged in that particular way. It should also be said that we are made up of a large amount of energy, which is not matter. Energy is only as old as when it was created. So with these two pieces of evidence, I disagree with you.