That Spiderman *cough* Spiderboy *cough* though. Not sure I like the young 15 year old approach.
Canonically, he gets his powers while in high school, when he's 15. Note that this origin was devised in the 1960s.
Just rewatched The Winter Soldier, and it’s interesting to see some of the hints and foreshadowing of Civil War.
And in Age of Ultron: "Every time someone tries to win a war before it starts, innocent people die."
Cap seems to be set up as the, "Innocent until proven guilty," guy, and Stark as, "Get them before they get us."
Cap always was the big boyscout who believed in the American ideal, rather than the American reality. He was about striving to be that ideal. Straight up; no irony.