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 Michael Jackson Facts Harry Styles Facts Neymar Facts Adam Driver Facts Aaliyah Facts Steve Jobs Facts Ariana Grande Facts Shaquille O'Neal Facts