Warning: Contains SPOILERS for 80 for Brady.Although 80 for Brady is inspired by a real story, not all the characters in the film correspond to real-life people, making the question of whether the 80 for Brady Dan is fictional or a real NFL player understandable. 80 for Brady does take creative liberties with its nonfictional source material as it tells the story of four lifelong friends who embark on a trip to see their hero, Tom Brady, and his New England Patriots play in the Super Bowl. While the movie is inspired by the real-life "over 80" fan club for Brady, some of the characters and plotlines only exist in the film.

https://screenrant.com/80-for-brady-dan-callahan-football-player-true-story/