A certain amount of aging can be faked if you have a few basic tools like a spokeshave, sharp fist sized rocks, and a chain-mail burnisher.
First take your spokeshave blade out, and place it back in so about 1 mm of one corner sticks out, then run this across the grain in a kind of sawing motion. This will give the appearance of a pit-sawn board, but be careful doing this, spokeshaves have a tendency to roll over onto ones fingers. Then take the sharp rock and rub, and occasionally knock the edge of the board. This will age the edges. Then sand any bad chipping or frassie bits, and burnish the whole board with the chain-mail to a shine. Should look fairly rustic after this, but how you finish this board will add aging to an extent also.