Upon reaching master status, airbenders are tattooed with five light blue arrows: one extending from the base of the spine to the forehead, one for each arm pointing to the hands, and likewise for the legs and feet. This pattern is an emulation of the flying bison's natural markings, as they were the first airbenders. Unlike most master airbenders who gain their status later in life, Avatar Aang received his tattoos when he was only twelve, following his invention of the air scooter. This made him the youngest known airbending master until his granddaughter Jinora received her tattoos at the age of eleven in 171 AG.