Their off-screen acrimony as Iron Man and Captain America is literally the plot of an entire movie (Captain America: Civil War) but their real life friendship is solid.
The pair are constantly gushing about each other. Last year, Evans called RDJ the "epitome of what a movie star is".
I feel like he walks in a room and he just glows. He owns the oxygen... I feel so much safer when he's around. It's like when you're a kid- if Dad's with you nothing bad can happen. Not to make Downey seem like my father, but there's something about him that makes you feel very protected.
And there are these lovely birthday messages Evans sent his bro:
Happy birthday to the one and only, @RobertDowneyJr!! (Am I the only one who thinks he’s aging in reverse?) I miss you, buddy!!