Diana Prince & Thor Odinson
No one knew her age and she was bound to keep it that way. Though, it wouldn't be hard if one knew which war she meant when talking about Steve Trevor. They'd have a slight idea of her age then.
"I have not tried dating against since my Captain Trevor."
That? She would admit to. No, she focused on her museums and helping those that needed it. Fighting to save the world, as it were.