Seniors in Greenburgh can commit to get fit and expand their horizons with a variety of classes starting in January and running throughout 2017 Senior citizens get first preference to enroll, except for QiGong, Meditation, and Spanish where non-senior adult residents can register for a slightly higher fee. Mah-Jongg class for beginners and advanced beginners starts Wednesday, Jan 4 from 10 a.m.-Noon.