Someone from medieval times would definitely be interesting, but there would be a great danger of it slipping into ridicule if they make them too dumb.
Concerning an elderly woman, you're in luck. Check out the "Nest Cottage saga" (that's how I call it. Other people call it Hornets' Nest, Demon Quest and Serpent Crest) and I think you'll love it. It's audio, so it's awesome by definition
It's 15 CDs in total and I think Audiogo also sells downloads for really not that much money. It's all written by Paul Magrs - he writes really good scripts.