The only actor on all of Pretty Little Liars who wasn't older than their character was Sasha Pieterse, who played the most complex character on the series, Alison DiLaurentis. Although Alison wasn't in many of the episodes of the earlier seasons (because — spoiler! — she was presumed to be dead), she was the one who bought the other main characters, Aria, Spencer, Hannah, and Emily together. And, as it turns out, Sasha Pieterse was actually much younger than her character in Season 1.
In an interview with Cosmopolitan, Pieterse explained that the age difference was always interesting to her. "The funny thing about [age] is, I shot the pilot when I was 12, and I was younger than Ali is supposed to be," she said. But, after a few years had passed, Pieterse outgrew Alison. "And now I'm older than Ali is supposed to be," she continued. Playing both older and younger than her actual age surely presented a challenge for the actor. But, a challenge that she totally nailed nonetheless.
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