Photo: Molly Hahn (Credit: Carolyn Nichols) Not all the big sports stars in Belmont are high schoolers, the slew of marathoners in town or the occasional Olympian. Last week, Birch Hill Road’s Marjorie “Molly” Hahn, 67, placed third in the Kitty Godfree Cup (for women 65 and over) at the ITF Super Senior World Team Championships […]