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 Lady Gaga Facts Tom Cruise Facts Ronaldo Facts Jim Carrey Facts Chester Bennington Facts Selena Gomez Facts Robin Williams Facts Kylie Jenner Facts