Tiffany's Age?

I never caught Tiffany's age on the show, I never really was wondering so I didn't pick it up, but I was reading through Wiki earlier and it states that she is 18? I know that Wiki is reknown for it's inaccuracies so that's why I'm wondering if anyone else caught her age on the actual show? If she really is 18 I'm totally shocked, she looks so much older than she really is, I always assumed her as being around 22/23 at least. Not saying that she isn't an attractive girl/ model, but still, it appears the ageing process is catching up with her!

This mess is gonna get raw, like sushi, so haters to the left...