If you don't know her age yet, you should find out. You need to take into consideration how big of an age difference it really is. Can you see each other as equals? Will other people be okay with the age difference or think it's creepy?
If the age difference is not too big, then ask her out on a date. That will give you a chance to talk and get to know each other without other people being there.
“This planet has - or rather had - a problem, which was this: most of the people living on it were unhappy for pretty much of the time. Many solutions were suggested for this problem, but most of these were largely concerned with the movement of small green pieces of paper, which was odd because on the whole it wasn't the small green pieces of paper that were unhappy.” ― Douglas Adams, The Hitchhiker's Guide to the Galaxy