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 Rihanna Facts Neymar Facts Lena Headey Facts Lady Gaga Facts Amy Winehouse Facts Justin Bieber Facts Chester Bennington Facts Dwayne Johnson Facts