Final answer:
Moses was 40 years old when he fled to Midian, escaping from Egypt after he intervened in the mistreatment of a Hebrew slave.
Step-by-step explanation:
Moses was 40 years old when he fled to Midian. This period in his life marks a significant transition from his upbringing in Egyptian royalty to his eventual role as the leader of the Hebrews' Exodus out of Egypt. The story, as detailed in the Bible, mentions Moses's flight from Egypt after he killed an Egyptian overseer mistreating a Hebrew slave. Fearing for his life, Moses escaped to the land of Midian where he would spend many years before being called by God to return to Egypt and demand the release of the Hebrews.