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 George Harrison Facts Kit Harington Facts Bruno Mars Facts Amy Winehouse Facts Adele Facts Jennifer Lawrence Facts Florence Henderson Facts Lady Gaga Facts