Dear Mr Cornwell, thanks to an article in the USA Today, I have discovered your work and love it. I started with The Saxon Series and I have just started Excalibur. My question is about the ages of Derfel, Nimue, Ceinwyn and Arthur. The three books have progressed through about 15-18 years (so far). What were the ages of the three when the tale first started? Thank you. Jim Smart