MAMAMOO‘s Hwasa is making waves with her positive mindset about aging. MAMAMOO’s Hwasa | @_mariahwasa/Instagram Hwasa debuted 10 years ago with MAMAMOO at age 20. [Video could not be displayed] In the Korean age system, Hwasa is 30 years old. She discussed her positive mindset related to aging. [Video could not be displayed] Instead of…