Screencap of Steve's 4F letter from the first movie:

His birthdate is given as July 4, 1918. The date of the letter is June 14, 1943. So he enlisted shortly thereafter, became Cap, rescued Bucky about three months or so later, and then Bucky plummets to his doom and Steve goes on ice two days later.
In the after-credits scene in CA:TWS, Bucky's birthdate on his museum memorial is 1917. So he's at least 6 months older than Steve in MCU continuity.

His birthdate is given as July 4, 1918. The date of the letter is June 14, 1943. So he enlisted shortly thereafter, became Cap, rescued Bucky about three months or so later, and then Bucky plummets to his doom and Steve goes on ice two days later.
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Date: 2014-04-12 02:11 am (UTC)ETA: I just noticed the day. Really, they just couldn't resist giving Captain America the 4th of July for his birthday, could they? :p
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Date: 2014-04-13 03:19 am (UTC)