Yes, the quotes are out of order tho.
Did Steve Rogers really live out his days with Peggy? Yes. It looks like, from his age, that Steve just stayed with Peggy after returning the Stones.
Wait, didn’t we see photos of Peggy with her kids? Were those Steve’s kids? Yes, Peggy had kids. No, they were not Steve’s — they were her other husband’s, who Steve rescued during the war. This still happened, just not in our “reality” since the story we saw from Steve’s perspective is linear and includes Peggy’s photographs of her children.
So there are two Captain Americas alive in the 2010s? Yes. One is old and has had a full life with Peggy, one gets pulled out of the ice having lost Peggy. One inevitably becomes the other, but they both exist."
"In a stable reality with a stable flow of time, all six Infinity Stones exist.
Given the rules laid out in the film, it seems impossible that alternate dimensions exist in the MCU (in the science-fiction sense, like there’s a doppleganger world). Instead, all possible realities are squished together in one flow of time, happening over, under, and simultaneously with each other. That’s the power all six Infinity Stones have over the universe.
If a stone is removed, a branch reality can be created, but that branch reality is unstable, dangerous, and is possibly unreachable from the Quantum Realm because it would be unmappable on Tony’s devices, which is based on a model of mapping Quantum Realm locations to places on the timeline. (People in the movie jump backwards and then to the present, no one is jumping to an undetermined future. Even Thanos needs to be lead from the past to the future) How would you map an alternate timeline that didn’t exist until you split it? You couldn’t.
The six stones create “what [we] experience as the flow of time.” The stones braid multiple human-perspective realities together into a single flowing existence. A character’s death removes them from the main flow of time (note that Frigga, Thor’s mom, still needed to be visited in the past before she died on Thor’s human-perspective timeline)."
So that means he got together with the same Peggy who had been married in her youth. Either to Steve himself or another man that could have died before Steve.
