É o jovem Steve do presente que foi ao passado morar com Peggy. Quando ele volta ao passado para retornar todas as Pedras do Infinito e Mjolnir à sua linha do tempo original, ele faz uma escolha lá e decide não voltar ao presente. Mais tarde, Steve aparece como um homem velho.
Como diretor Joe Russo explica,
"It's not a time loop," according to Joe Russo in a recent Q&A. "Both Ancient One and Hulk were right. You can't change the future by simply going back to past. But it's possible to create a different alternate future. It's not butterfly effect. Every decision you made in the past could potentially create a new timeline. For example, the old Cap at the end movie, he lived his married life in a different universe from the main one. He had to make another jump back to the main universe at the end to give the shield to Sam."
A partir de um encadeamento do reddit com a tradução de artigo original,
Did Captain America's action at the end affect the timeline? Does that mean there was a time where two CA existed in a same universe?
A: To me, CA's action in the end wasn't the fact he wanted to change anything, it's more like me has made a choice. He chose to go back to past and lived with the one he loved for the rest of his life. The time travel in this movie created an alternate reality. He lived a completely different life in that world. We don't know how exactly his life turned out, but I'd like to believe he still helped many others when they were needed in that world. Yes, there were two CA in that reality, it's just like what Hulk said, what happened in the past has already happened. If you go back to past, you simply created a new reality. The characters in this movie created new timeline when they went back to the past, but it had no effect to the prime universe. What happened in the past 22 movies was still canon.
Em conclusão, era uma linha do tempo alternativa criada pela escolha que o jovem Rogers fez.