With a nod to all the "mother joke" writers out there:

Those DC-10s are so old, Moses flew the friendly skies.

Those DC-10s are so old, they used to be called chariots.

Those DC-10s are so old, one crashed in the Dead Sea when it was still alive.

Those DC-10s are so old, their flight numbers are in Roman numerals.

Those DC-10s are so old, they were the official planes of the Boston Tea Party.

Those DC-10s are so old, the Burger King used to fly on them when he was still prince.

Those DC-10s are so old, their liveries used to be in hieroglyphics.