Sasha Pieterse is opening up about battling multiple medical issues behind closed doors, and being ignored by the people meant to help her. Michael Tullberg / Getty Images Sasha Pieterse is opening up about battling multiple medical issues behind closed doors, and being ignored by the people meant to help her. Sasha was just 12 years old when she was cast in Pretty Little Liars, and she went on to star in the series until her early 20s.