From the lead trio in the "Harry Potter" movies to the "Stranger Things" cast, young actors aging and accommodating stories for them as they grow up is a challenge that’s inevitable for projects centered around kids. Netflix’s "Avatar: The Last Airbender" will also face this hurdle, as the series centers around the 112-year-old Avatar Aang, who looks and acts like he’s 12 because he’s been frozen in ice for 100 years. So, with that in mind, Albert Kim, the series' showrunner, opened up about how they’ll handle the cast growing up, and I think it’s super smart.

While "Percy Jackson's" producers aren’t worried about their cast getting older, because there are time jumps worked into the source material’s plot – like it was with "Harry Potter," "Last Airbender" doesn’t have that luxury. In the animated Nickelodeon series, Aang and co.’s journey lasts about one year, and we see it play out over three seasons. Obviously, the "Avatar: The Last Airbender" cast is going to grow up a lot in the years between Seasons 1, 2 and 3, making the OG series timeline unrealistic.