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Here are all the ages of the young cast.
The Stranger Things cast and their characters have all grown up a lot since the show debuted in 2016. Here's your guide to all the actors' ages now and how they compare to the characters they play. [Rachel Murray/Getty Images for Netflix]
Millie Bobby Brown (born February 19, 2004) is 18 years old. She was born in Marbella, Spain. In Stranger Things 4, Millie's character Eleven is 15 years old.
Finn Wolfhard (born December 23, 2002) is 19 years old. Finn was born in Vancouver, Canada. In Stranger Things 4, Finn's character Mike Wheeler is 15 years old.
Noah Schnapp (born October 3, 2004) is 17 years old. In Stranger Things 4, Noah's character Will Byers is 15 years old.
Natalia Dyer (born January 13, 1997) is 25 years old. In Stranger Things 3, Natalia's character Nancy Wheeler is 19 years old.
Joe Keery (born April 24, 1992) is 30 years old. He is a graduate of DePaul University. In Stranger Things 4, Joe's character Steve is 20 years old.
British actor, Charlie Heaton (February 6, 1994) is 28 years old. He was born in Bridlington, East Yorkshire, England. In Stranger Things 4, Charlie's character Jonathan is 19 years old.
Gaten Matarazzo (born September 8, 2002) is 19 years old. Before Stranger Things, Gaten appeared on Broadway in Les Misérables. In Stranger Things 4, Gaten's character Dustin is 15 years old.
Caleb McLaughlin (born October 13, 2001) is 20 years old. Like his co-star Gaten Matarazzo, Caleb also got his start on Broadway. He played young Simba in a stage adaptation of The Lion King. In Stranger Things 4, Caleb's character Lucas is 15 years old.
Priah Ferguson (born October 1, 2006) is 15 years old. Priah was born and raised in Atlanta, Georgia. She was cast in Stranger Things because they film the show close to her hometown. Erika is 11 years old in Stranger Things 4.
Sadie Sink (born April 16, 2002) plays Max on Stranger Things. Sadie is 20 years old. In Stranger Things 4, Sadie's character Max is 15 years old.
Dacre Montgomery (born November 22, 1994) plays Billy on Stranger Things. Dacre is 27 years old. In season 3 of Stranger Things, Dacre's character Billy is 18 years old.
Maya Hawke (born July 8, 1998) is 20-years-old. Maya's character Robin is still in school in Stranger Things 4, making her around 18 years old.
Winona Ryder (born October 29, 1971) is 50 years old. She plays Joyce Byers who is likely in her early 40s in Stranger Things 4.
David Harbour (born April 10, 1975) is 47 years old. He plays Jim Hopper who is likely in his early 40s in Stranger Things 4.
Eduardo Franco (born August 29, 1994) is 27 year's old. Eduardo plays Argyle who becomes Jonathan's best friend in Stranger Things 4. In season 4, Argyle is likely the same age as Jonathan, so around 19 years old.
Joseph Quinn (born May 15, 1993) is 29 years old. Joseph joins the Stranger Things cast in season 4 as Eddie Munson, the leader of the Hellfire Club. Eddie's age is never specified in Stranger Things 4 but it's likely that he is around 21 given that he's failed his final year of school multiple times.