Original sentence: Gehrke never lost his fascination with extraterrestial biology; he was active in organizing conferences and working with researchers on space explorations and the future of humankind in space until he was over 80 years old.They married Christmas Day (25 December) 1941 at Zanesville, Ohio, and she passed away on their anniversary day 65 years later (2006)
Edited sentence: Gehrke never lost his fascination with extraterrestrial biology; he was active in organizing conferences and working with researchers on space explorations and the future of humankind in space until he was over 80 years old.They married Christmas Day (25 December) 1941 at Zanesville, Ohio, and she died on their anniversary day 65 years later (2006)