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?72 Tags: birth day 29birth month septemberbirth year 1954 Suggested Posts Mike Tyson Facts Amy Adams Facts Harry Styles Facts Emma Watson Facts Leonardo DiCaprio Facts The Weeknd Facts Stephen Hawking Facts Justin Timberlake Facts