The final season of "Sex Education" is eight episodes long.
Samuel Taylor / Netflix
The final season of "Sex Education" is available now on Netflix.
Many of the actors are in their late 20s, while the characters they play are high school students.
Ncuti Gatwa is a 30-year-old actor while his character Eric Effiong is 17.
Asa Butterfield is 26 years old while his character Otis Milburn is 17.
Asa Butterfield has starred in all four seasons of "Sex Education."
Samuel Taylor / Netflix / Dave Benett / Getty Images for Mithridate
Asa Butterfield plays one of the lead characters of "Sex Education," Otis Milburn. Otis is a shy nerd who forms a sex clinic in Moordale Secondary School after being inspired by his friends and his own sex therapist mother.
After Moordale closes down, Otis spends season four trying to form a new clinic at his new school, Cavendish College. According to the press notes for season four, Otis is now 17.
Emma Mackey is 27 years old while her character Maeve Wiley is 18.
Emma Mackey has starred in all four seasons of "Sex Education."
Samuel Taylor / Netflix / Joe Maher / BAFTA / Getty Images for BAFTA
Emma Mackey plays Maeve Wiley, a rebellious student who has had a difficult upbringing. In the fourth season, she has gone to a writing program at Wallace University in America.
According to the press notes for the show, Maeve is now 18.
Eric Effiong is likely 17, like Otis. However, Ncuti Gatwa is 30 years old.
Ncuti Gatwa has starred in all four seasons of "Sex Education."
Samuel Taylor / Netflix / Dave Benett / Getty Images for Evian
Ncuti Gatwa plays the fan-favorite character Eric Effiong, a proud gay student who is figuring out his identity. He is also Otis' best friend and is likely to be between 17 and 18 since the pair have been in classes together in previous seasons.
In season four, Eric also attends Cavendish to complete his A-Levels.
Connor Swindells is also 27 years old, while his character Adam Groff is likely 17.
Swindells, Gatwa, and Mackey all starred in the 2023 hit "Barbie" movie.
Samuel Taylor / Netflix / Wiktor Szymanowicz / Anadolu Agency via Getty Images
Adam Groff, played by Connor Swindells, was a former bully of Moordale and an ex-boyfriend of Eric. In the fourth season, he decided not to return to school and instead find a job. Adam is also likely to be between the ages of 17 and 18 in season four.
Aimee Lou Wood is 29 years old, though her character Aimee Gibbs is a teenager.
Aimee Lou Wood has starred in all four seasons of "Sex Education."
Netflix / Tristan Fewings / Getty Images
Aimee Lou Wood coincidentally plays a character called Aimee Gibbs. Aimee is a close friend of Maeve and is another Moordale student who joins Cavendish College. She is likely to be between the ages of 17 and 18 too.
Kedar Williams-Stirling is 28 years old. His character, Jackson Marchetti, is likely 17.
Kedar Williams Stirling has starred in all four seasons of "Sex Education."
Samuel Taylor / Netflix / Victoria Jones / PA Images via Getty Images
Jackson Marchetti (Kedar Williams-Stirling) is another Moordale student who has to transfer to Cavendish in season four. He is a former flame of Maeve and is still reeling from being rejected by Cal Bowman.
Jackson is also likely to be 17 or 18 since he has shared classes with the other Moordale students.
Mimi Keene is one of the younger lead actors, at 25 years old. But Ruby Matthews is likely 17.
Mimi Keene has starred in all four seasons of "Sex Education."
Samuel Taylor / Netflix / Jed Cullen / Dave Benett / Getty Images
Ruby Matthews (Mimi Keene) was part of the mean popular group at Moordale. However, she is the only member to attend Cavendish in season four, hence she is forced to make new friends.
Since Ruby shared classes with the other Moordale lead characters, she is likely between the ages of 17 and 18.
Chinenye Ezeudu is 27 years old, while her character Viv Odusanya is likely 17.
Chineye Ezeudu joined the cast in season 2 of "Sex Education."
Samuel Taylor / Netflix / Marc Piasecki / WireImage
Viv Odusanya (Chinenye Ezeudu) was introduced in season two as a study-focused student who befriends Jackson when they are forced to study together. Viv also transfers to Cavendish in season four, and is likely 17 or 18 in this final season like the other students.
While Cal Bowman is 18, they are played by Dua Saleh who is 28.
Dua Saleh joined the cast in season 3 of "Sex Education."
Samuel Taylor / Netflix / David M. Benett / Dave Benett / Getty Images for EE
Cal Bowman (Dua Saleh) was introduced in season three as a non-binary student who joins Moordale and befriends Jackson. In season four, Cal joins Cavendish and struggles with their transition.
According to press notes for the season, Cal is 18. Saleh, who is also non-binary, is ten years older than the character they play.
Gillian Anderson, who is 55 years old, plays Otis' mother Jean Milburn. Jean is likely 48 or 49.
Gillian Anderson is known for her roles on "X-Files" and "The Crown."
Netflix / Jeff Spicer / Getty Images
Jean Milburn (Gillian Anderson) has been one of the main central adult characters since season one. In this season, she is trying to balance a new career opportunity with raising Otis and her newborn baby Joy.
According to the HuffPost, Jean was 48 in season three. Since season four appears to take place a few months or weeks after season three, she is likely between the age of 48 and 49.
Thaddea Graham is a new cast member who is 26 years old. Her character, O, is 17.
Thaddea Graham previously starred in "The Irregulars" and "The Letter for the King."
Samuel Taylor / Netflix / Dave J Hogan / Getty Images
At Cavendish College, Otis' main rival is O (Thaddea Graham), who had already established a sex clinic on campus. According to the press notes for season four, O is 17.
Lisa McGrillis plays Jean's sister Joanna. McGrillis is 41 but Joanna is 42.
Lisa McGrillis is one of the new cast members of season four of "Sex Education."
Netflix / Antony Jones / BAFTA / Getty Images for BAFTA
Jean's sister Joanna (Lisa McGrillis) is introduced in the final season as she comes to try and help the struggling mother with taking care of Joy. According to the press notes for the show, Joanna is 42.
Dan Levy, who is 40, joins the cast as another new character. He plays Maeve's new teacher Thomas Molloy, who is in his late 30s.
Levy is known for his role in "Schitt's Creek"
Samuel Taylor / Netflix / Paul Morigi / Getty Images
At Wallace University, Maeve is taught by a successful author Thomas Molloy, who is incredibly hard on the students. According to the press notes, Thomas is in his late 30s.
