Geoff Marcy [Edit] By Sticky Facts Editorial StaffGeoff Marcy biography, ethnicity, religion, interesting facts, favorites, family, updates, childhood facts, information and more:Geoff Marcy date of birth:September 29, 1954How old is Geoff Marcy?71 Tags: birth day 29birth month septemberbirth year 1954 Suggested Posts Ronaldo Facts Robert Downey Jr. Facts Cristiano Ronaldo Facts Kim Kardashian West Facts Adam Driver Facts Dwayne Johnson Facts Justin Bieber Facts Vin Diesel Facts