Warning: Contains SPOILERS for Stranger Things season 4.
The story of Stranger Things season 4 goes back to the past of Hawkins Lab, raising the question of just how old Eleven (Millie Bobby Brown) is during those flashbacks. Set around five months after season 3, Stranger Things 4 pushes its story forward but also dives back into the past more than ever before, in a variety of ways. This includes its more recent past, with Nancy Wheeler (Natalia Dyer), Steve Harrington (Joe Keery), Robin Buckley (Maya Hawke), and newcomer Eddie Munson (Joseph Quinn) visiting the Upside Down and discovering it's stuck in 1983. The events go much further back, though, with Stranger Things season 4's story also heading to the late-1950s, and the arrival of Victor Creel (Kevin L. Johnson) and family in Hawkins, giving the narrative a much greater scope.
The past events that get the most focus, though, belong to Eleven and her time at Hawkins Lab. As part of efforts for Eleven to get her powers back, it means using the Nina Project to force her to confront what happened in the Rainbow Room, reliving past moments and traumas over and over again until she finally does rediscover her abilities. It's a slow, painful process for Eleven who has to come to terms with what truly happened there, which is given even more weight by just how young she is at this point.
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Like most of Stranger Things' younger characters, Eleven was born in 1971, and was implied to be 12-years-old in Stranger Things season 1, with it said her mother, Terry Ives (Aimee Mullins) had maintained her nursery for a dozen years. Although her exact date of birth is unknown, the Hawkins Lab scenes are
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