What is the right age to introduce kids to our epics? Or it is not required at all to introduce them to mythology, considering the fact that we don't know it existed in reality or not?

Mythological stories, whether true or not is not important. What is the alternative? Fairy tales like cinderella,alladin, minnions,etc? Arent those fiction too? There are a lot of morals to learn from mythological tales so why not give your children an insight into them?Don't cut it out entirely.