What is a great age to begin flying lessons?

I'm really into flying but don't know when to start.

Depends really on the person and where they are financially; the lessons aren't exactly cheap. Personally I began flying lessons at 16 and I think anywhere around 16-18 is a good time because you're in high school and have the time on the weekends to complete the training such as the book work, air time, and eventually the final trip.