We enjoy the Tales, too; though at a later age. Mine are 9 and 10 and I am introducing them now. Isn’t the history of Grimm’s tales that they were for a more mature audience?
Mine have enjoyed complete tales of H.C. Anderson and a collection of Charles Perrault (you know-Blackbeard-that was creepy), some Irish tales (I have to draw a line w/some of the more extremely supernatural ones), Arabian Nights, and those of others in our old versions of children’s story collections. We consider Folk and Fairy Tales a good reflection of a culture and important in our learning about the history of a particular people of country (not to mention, much enjoyment of many stories, regardless of historical contextual learning!).
I, too, say go ahead at what age you deem them appropriate for your children.
Rachel