Donald Pettit Status: Active 4/20/1955 – Nationality: American Type: Government Agency: National Aeronautics and Space Administration Donald Roy Pettit is an American chemical engineer and a NASA astronaut. He is a veteran of two long-duration stays aboard the International Space Station, one space shuttle mission and a six-week expedition to find meteorites in Antarctica. As of 2018, at age 63, he is NASA’s oldest active astronaut.