Here are the Real Ages of the Stranger Things Actors and their Characters

Finn Wolfhard as Mike Wheeler

Actor, 19 years old, was born on December 23, 2002. Mike was born on April 7, 1971. He was 12 in Season 1, 13 in Season 2, 14 in Season 3, and will be 15 in Season 4 according to the graphic novel Stranger Things and Dungeons & Dragons.

Millie Bobby Brown as Eleven

Actress, 18 years old, was born on February 19, 2004. Eleven was born in 1971. She was 12 in Season 1, 13 in Season 2, 13 or 14 in Season 3, and will be 14 or 15 in Season 4.

Gaten Matarazzo as Dustin Henderson

Actor, 19 years old, was born on September 8, 2002. Dustin was born in 1971. Making him  12 years old in Season 1, 13 years old in Season 2, 13 or 14 years old in Season 3, and 14 or 15 years old in Season 4.

Caleb McLaughlin as Lucas Sinclair

Actor, 20 years old, was born on October 13, 2001. Character's birth year is 1971. Lucas was 12 years old in Season 1, 13 years old in Season 2, 13 or 14 years old in Season 3, and 14 or 15 years old in Season 4.

Noah Schnapp as Will Byers

Actor, 17 years old, was born on October 3, 2004. Will was born on March 22, 1971, as seen in the Season 2 episode "The Mind Flayer," making him 12 in Season 1, 13 in Season 2, 14 in Season 3, and 14 or 15 in Season 4.

Sadie Sink as Max Mayfield

Actress, 20 years old, was born on April 16, 2002. Max was born in 1971, making her 13 years old when she first appears in Season 2, 13 or 14 years old in Season 3, and 14 or 15 years old in Season 4.

Joe Keery as Steve Harrington

Actor, 30 years old, was born on April 24, 1992. Steve was born in 1966, making him 17 years old in Season 1, 18 years old in Season 2, 18 or 19 years old in Season 3, and 19 or 20 years old in Season 4.

Dacre Montgomery as Billy Mayfield

Actor, 27 years old, was born on November 22, 1994. Billy was born in 1967, making him 17 years old when he first appears in Season 2, 17 or 18 years old in Season 3, and 18 or 19 years old in Season 4.

Natalia Dyer as Nancy Wheeler

Actress, 27 years old, was born on January 13, 1995. Nancy was born in 1967, making her 16 years old in Season 1, 17 years old in Season 2, 17 or 18 years old in Season 3, and 18 or 19 years old in Season 4.

Charlie Heaton as Jonathan Byers

Actor, 28 years old, was born on February 6, 1994. Jonathan was born in 1967, making him 16 in Season 1, 17 in Season 2, 17 or 18 in Season 3, and 18 or 19 in Season 4. He was born in 1967, making him 16 in Season 1, 17 in Season 2, 17 or 18 in Season 3, and 18 or 19 in Season 4.

Maya Hawke as Robin Buckley

Actress, 23 years old, was born on July 8, 1998.  Robin's age was shown to be a school year behind Steve when she first appeared onscreen in Season 3, making her born in 1968 and 17. She is either 17 or 18 in Season 4.

Priah Ferguson as Erica Sinclair

Actress, 15 years old, was born on October 1, 2006. Erica was born in 1975, thus she is 9 years old in Season 2, 9 or 10 years old in Season 3, and 10 or 11 years old in Season 4.

David Harbour as Jim Hopper

Actor, 47 years old, was born on April 10, 1975. Character age: According to the canon book Stranger Things: Darkness on the Edge of Town, Hopper was 35 years old in 1977, making him a 1942 baby. In Season 1, he is 41, in Season 2, he is 42 or 43, and in Season 4 he is 43 or 44.

Winona Ryder as Joyce Byers

Actress, 50 years old, was born on October 29, 1971. Joyce's age is shown to be the same as Jim Hopper's in Stranger Things season 1, when the two discuss their high school acquaintance. Because Hopper was born in 1942, Joyce is expected to be 41 in Season 1, 42 in Season 2, 42 or 43 in Season 3, and 43 or 44 in Season 4.