Question: In the South Park episode "You're Getting Old" which follows "Ass Burgers", Stan celebrates which birthday?

full_context: Document 1: The Poor Kid: "The Poor Kid" is the fifteenth season finale of the American animated television series "South Park", and the 223rd episode of the series overall. It first aired on Comedy Central in the United States on November 16, 2011. In the episode, Kenny and his brother and sister are sent to a foster home after police discover a meth lab in their house. As a result, Cartman is left with feelings of loss, since he no longer has someone to ridicule for their poverty.
Document 2: Grey Dawn: "Grey Dawn" is the tenth episode in the seventh season and the 106th overall episode of the animated television series "South Park". It originally aired on Comedy Central in the United States on November 5, 2003. In the episode, senior citizens are running over people in the city of South Park, causing them to lose their driver's licenses. Soon, the AARP comes to help them and take over the town.
Document 3: Medicinal Fried Chicken: "Medicinal Fried Chicken" is the third episode of the fourteenth season of the American animated television series "South Park", and the 198th episode of the series overall. It originally aired on Comedy Central in the United States on March 31, 2010. In the episode, the South Park KFC is replaced by a medical marijuana dispensary, and Cartman gets involved in black market selling the KFC chicken. Meanwhile, Randy Marsh gets a medical referral for marijuana by giving himself testicular cancer, which makes his testicles grow to grotesquely huge proportions.
Document 4: The Last of the Meheecans: "The Last of the Meheecans" is the ninth episode of the fifteenth season of the American animated television series "South Park", and the 218th episode of the series overall. It first aired on Comedy Central in the United States on October 12, 2011. In the episode, what begins as an innocent game between the boys turns serious when Cartman joins the U.S. Border Patrol. Unsurprisingly, Cartman turns out to be really good at stopping Mexicans.
Document 5: Ass Burgers: "Ass Burgers" is the eighth episode of "South Park"' s fifteenth season and the 217th episode of the series overall. It first aired in the U.S. on October 5, 2011, on Comedy Central. The episode picks up where the previous episode, "You're Getting Old", left off. Stan's cynicism is mistakenly blamed on his recent vaccinations and diagnosed as Asperger syndrome, a criticism of anti-vaccination proponents. Cartman mishears the condition as "ass burgers" and opens a food stand in which the secret ingredient involves stuffing his underwear with hamburgers. The episode is rated TV-MA-L in the United States.
Document 6: City Sushi: "City Sushi" is the sixth episode of the fifteenth season of the American animated sitcom "South Park", and the 215th episode of the series overall. It premiered on Comedy Central in the United States on June 1, 2011. In the episode, Butters is misdiagnosed with multiple personality disorder. Meanwhile, Tuong Lu Kim takes on South Park's new Japanese resident, who has put a sushi restaurant right next to his City Wok.
Document 7: Tonsil Trouble: "Tonsil Trouble" is the first episode in the twelfth season of the American animated television series "South Park", and the 168th episode of the series overall. Written and directed by series co-creator Trey Parker, it first aired on Comedy Central in the United States on March 12, 2008. In the episode, Cartman contracts HIV during a blood-transfusion. When Kyle laughs at Cartman's misfortune, Cartman intentionally infects Kyle with his disease as well.
Document 8: South Park (season 15): The fifteenth season of the American animated sitcom "South Park" began airing on Comedy Central on April 27, 2011 and ended on November 16, 2011. In response to reactions to the mid-season finale episode "You're Getting Old", which seemed to insinuate that creators Trey Parker and Matt Stone were wrapping up the series, Comedy Central proclaimed through the media that "South Park" was renewed for two more seasons, and the duo were signed through 2013. Shortly before the airing of the season finale episode "The Poor Kid", "South Park" was extended again until 2016, taking the show to 20 seasons. Parker was the director and writer for all episodes, and Robert Lopez was the writer in this eleventh episode for the fifteenth season.
Document 9: The Tale of Scrotie McBoogerballs: "The Tale of Scrotie McBoogerballs" is the second episode of the fourteenth season of the American animated television series "South Park", and the 197th overall episode of the series. It originally aired on Comedy Central in the United States on March 24, 2010. In the episode, the South Park boys write a vulgar book with the sole intention of getting it banned. When Stan's parents discover the manuscript, the boys accuse Butters of writing it, then are enraged when it becomes hailed as a literary masterpiece.
Document 10: You're Getting Old: "You're Getting Old" is the seventh episode and the mid-season finale of the fifteenth season of the American animated television series "South Park", and the 216th episode of the series overall. It first aired on Comedy Central in the United States on June 8, 2011. In the episode, Stan begins to develop a profound sense of cynicism after celebrating his tenth birthday, where he is literally seeing everything as "crap". Meanwhile, Randy latches onto a new music genre, "tween wave," in an attempt to fit in, which causes problems in his marriage with Sharon.
Document 11: Death (South Park): "Death" is the sixth episode in the first season of the American animated television series "South Park". It originally aired on Comedy Central in the United States on September 17, 1997. In the episode, Grandpa Marvin tries to convince Stan to kill him, while the parents of South Park protest the foul-mouthed cartoon "Terrance and Phillip". Death himself arrives to kill Kenny, and presents a warning to Grandpa Marvin against forcing others to help him commit suicide.
Document 12: T.M.I. (South Park): "T.M.I." is the fourth episode of the fifteenth season of the American animated television series "South Park", and the 213th episode of the series overall. "T.M.I." premiered in the United States on Comedy Central on May 18, 2011. The episode centers on Eric Cartman being sent to an anger management class after he protests what he mistakenly believes to be the school's publicizing the male students' penis sizes. "T.M.I." was written and directed by series co-creator Trey Parker, and was rated TV-MA-L in the United States.
Document 13: A Song of Ass and Fire: "A Song of Ass and Fire" is the eighth episode in the seventeenth season of the American animated television series "South Park". The 245th episode of the series overall, it first aired on Comedy Central in the United States on November 20, 2013. The episode serves as a continuation of the previous episode, "Black Friday", in which the children of South Park, role-playing as characters from "Game of Thrones", are split into two factions over whether to collectively purchase bargain-priced Xbox One or PlayStation 4 video game consoles at an upcoming Black Friday sale at the local mall, where Randy Marsh has been made the Captain of mall security. The story arc concludes with the following episode, "Titties and Dragons".
Document 14: Douche and Turd: "Douche and Turd" is the eighth episode of the eighth season of the animated television series "South Park", and the 119th episode overall. Written by series co-creator Trey Parker, it first aired on Comedy Central in the United States on October 27, 2004, just before the 2004 presidential election. In the episode, PETA forces South Park Elementary to change their school mascot, so an election is held to determine a new mascot. Stan ends up getting exiled from South Park after refusing to vote.
Document 15: Randy and Sharon Marsh: Randy Marsh and Sharon Marsh (née Kimble) are fictional characters in the animated television series "South Park". They are the most prominent set of parents on the show and a middle-class married couple who raise their 10-year-old son Stan and 13-year-old daughter Shelly in the fictional town of South Park, Colorado. Their first names are derived from the first names of series co-creator Trey Parker's parents, and Parker describes Randy as "the biggest dingbat in the entire show". According to the season 16 episode "Reverse Cowgirl", the Marsh home address is 260 Avenidas de los Mexicanos.
ground_truth: tenth birthday