Ever since the release of Avengers: Endgame, fans have wondered about Cap’s life in the alternate timeline with Peggy. What year did he return to her? How long did they have together? Well now we may have very good idea about all of those details.
Based on a WIRED video about the special effects in the movie that reveals that “old Cap” at the end of Avengers: Endgame is 106 years old; Redditor u/thanksredditformemes was able to calculate the exact year he returned to Peggy and how long they lived together.
Based on his age of 106 in Endgame, Cap returned to Peggy in 1947 (a couple of years after the war ended) and they lived together for 69 years before her death in 2016. It also proves that he did make another time jump back to the 2023 timeline to give Sam the shield, as he would’ve been 106 in 2016 when Peggy passed away.
Again it’s all based on the age given in the VFX video, but it lines up with established MCU canon in terms of years; as Cap would’ve been 37 when he took the stones back.
It’s an unexpected way to get the dates for that alternate timeline, but it’s something fans have been curious about for a few months.