End Game Q&A from Russo Brothers

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In the recent interview Jon Russo just had in China, he answered dozens of questions regarding the plot of EG.
Source
https://ent.qq.com/a/20190429/007983.htm

Why Ironman has to be the one to do the final snap, couldn't the people like Thor, Starlord or Captain Marvel whom all previously have handled the power of Infinity Stones done it instead?
Thor in this movie couldn't do it, only Hulk was strong enough to do the snap without dying. We are still not sure whether Captain Marvel can also withstand all the power of Infinity Stones at once. The reason we choose to let Ironman do it in the end was because he was the closest one to Thanos at the time. In all the futures Doctor Strange foresee, Ironman was the only one who could get close to Thanos and do the snap. People usually think the death of a hero is a horrible tragedy. But we think this is different. When his death was able to bring back hope, to save half of the universe, then his death was powerful and meaningful. We shouldn't feel too sad or anger about it.

Peggy Carter was probably already married and in her mid 40s in 1970, in that case what year was it that Captain America went back to dance with her?
We can't answer it for now, this is a story that happened in an alternate reality. Maybe it will be revealed in the future.