Movie Title Help?

It was about a woman born in like, 1940 and she got in a car crash into a lake. Some lightning struck the pond and she comes back to life, but never aging. So she's alive today and will not age, forever being like, 40. Even her children are older then her. Some man falls in love with her and she says something like "Tell me something I can hold onto forever and ever" and he says something like "Nothing" or "Don't" It's based on a true story. Anyone know what it's called? It looked cool.