There is this girl I like. we're listening.?

Okay I've know this girl for about a week and we've talked like three times. The first two were really short and just recently We we're with a group of friends and I got to see a side of her that I really really liked.The thing is there is a huge age difference. When I say huge I mean eight years. I'm turning 22 in a few days and shes 30. When I first saw her I would have guessed that she was around my age around her mid twenties or so. I know she has a kid and even if we do start dating the whole kid issue isn't a long ways away. The problem is the age difference. I've dated a girl in her thirties before and for some time it was great. The thing that's bothering me what happens if we do start dating and we like each other fall in love have kids and grow old together. She might die years before I do and I would be left alone for the last few years of my life. I know that's it's a bit insane to be thinking that far off into the future but that's what I'm looking for a partner to spend the rest of my days with. So any advice?