Why do you think so many different cultures have stories in which young people triumph over forces much greater and more experienced? can you think of other stories that feature young heroes against forces of evil? discuss a few.

Different cultures have stories in which young people triumph over forces much greater and more experienced because they all want to tell us that your motive and will power values more over your experience and physical power.
If one's intentions are good, and his/her will power is strong, with determination and inspiration he /she can win over anyone, even who is much more experienced or powerful.
For instance,
Fiction: Harry Potter.
Harry is a inexperienced wizard boy who overcame the dark Lord because he was on the good's side, and the good were on his side.

The last one i think