So, in Marvel comics, there's this thing called a telescoping timeline. Basically it means that the father things back are in comics history, the more compressed the time gets (the rough guide is four years RL time = one year comics time). This was done to avoid dealing with 90-year-old characters.
The issue with that is that it also pulls events like birthdays forward. So originally, Tony was born in the '40s, and was in his 20s when he became Iron Man, now he was born in the '70s and still became Iron Man in his 20s, but is probably in his thirties now.
Steve was born... well sometime between 1919 and 1922 (depending on the canon). We know he became Cap in '41 and was frozen in '45, at somewhere between 23 and 27. He's lived as long as Tony has in costume (he was thawed out shortly after Tony became Iron Man, and is probably in his late 30s/Early 40s.
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The issue with that is that it also pulls events like birthdays forward. So originally, Tony was born in the '40s, and was in his 20s when he became Iron Man, now he was born in the '70s and still became Iron Man in his 20s, but is probably in his thirties now.
Steve was born... well sometime between 1919 and 1922 (depending on the canon). We know he became Cap in '41 and was frozen in '45, at somewhere between 23 and 27. He's lived as long as Tony has in costume (he was thawed out shortly after Tony became Iron Man, and is probably in his late 30s/Early 40s.