This is an old thread but I just ran across it. At 45, I have always been attracted to younger women. My current g/f of a year and a half is 15 years my junior. Granted, 30 is a little different than 19 but...
As far as "taking a chance", we are always doing that. Every relationship can only end on of two ways...either you stay together or you don't. As recently as when I was 38 I dated a 20 year old who had more maturity than half the women I know who are twice her age. I'm sure that's an exception, but you never know who is and who isn't until you try.
Just get ready for the jokes from your friends..."Where you taking her tonight? Chuck-E-Cheese?"