"X-Men: Days of Future Past" fits into the X-Men timeline as a pivotal entry that combines elements from both the original trilogy and the prequel series. The film is set in a dystopian future where mutants are hunted by Sentinels. It involves time travel, with Wolverine sent back to 1973 to prevent an event that leads to this bleak future. This effectively creates an alternate timeline, allowing for the reboot of character arcs and timelines, particularly influencing events in "X-Men: Apocalypse" and "Dark Phoenix."

No, "X-Men: Days of Future Past" did not flop; it was a commercial success. Released in 2014, the film grossed over $748 million worldwide against a production budget of approximately $200 million. It received positive reviews from critics and audiences alike, praised for its engaging storyline and strong performances, particularly from the cast of both the original and newer X-Men films. The movie revitalized the franchise and set the stage for future installments.

"X-Men: Days of Future Past" is not strictly a prequel; it is a sequel that combines elements of both the original X-Men trilogy and the rebooted "X-Men: First Class." The film features a dual timeline, with characters from the past (1960s) and the future (2020s) as they attempt to prevent a dystopian future caused by mutant persecution. By sending Wolverine's consciousness back in time, the story bridges the two eras, altering events and character arcs, making it a pivotal film in the X-Men franchise.

In "X-Men: Days of Future Past," Magneto, portrayed by Ian McKellen in the future timeline, is approximately 70 years old, as the film is set in a dystopian future around 2023 and he was born in the early 20th century. In the past timeline, played by Michael Fassbender, he is in his 30s, as the events take place in the early 1970s. The character's age reflects his long life as a mutant and the historical events he has lived through.