Grains have been popular for a thousand or more years, so baking is a very old practice.
I'm thinking of making a key lime pie today. I love baking! That's awesome! A baker is one who bakes, and sometimes sells, baked goods. I'm just a humble home baker. I make things just for my family and friends to enjoy.
Since grains have been a staple food for millennia, the activity of baking is a very old one.