Other than StarTrek.com, where does Ezri's 2354 birthdate come from? I thought they might have backdated it from when she was at the Academy, although, as far as I remember, we never heard now many years it had been since she graduated on the series.
Well, it's 21 years before she joined the DS9 crew, I guess reflecting the original intent that the character was fresh out of the Academy at the time. I'm unaware of any other source. However, Nicole de Boer was 27 when she debuted as Ezri.