With his successful 1985 ascent he became the oldest person to reach the summit of Mount Everest, aged 55. He climbed with David Breashears and Nepalese sherpa Ang Phurba, surpassing the record by five years set in April of that year by Englishman Chris Bonington. Bass's record stood until 1993 when it was broken by 60 year old Ramon Blanco.