I've been talking with a friend who's an identical twin and says he was born first.
I think that by the time he was a couple of days or weeks old, his parents had probably muddled the two of them up and so he can't really be sure be sure whether's he's the first one or the second one out.
AIBU to think that parents of twins can never really say for sure which was first out once they've left the hospital and let the babies "mingle" for a few days? (Can you tell that I'm not busy at work today?!