6 And Moses and Aaron did as the Lord commanded them, so did they.

7 And Moses was fourscore years old, and Aaron fourscore and three years old, when they spake unto Pharaoh.

We do not know exactly how old Moses was when he left Egypt for Midian. While in that strange land he got married, had two sons, lived as a shepherd, and all the Egyptians who wished to condemn him died. It’s entirely possible that he left Egypt as a young man, and had spent as much as sixty years living this other life. And while we do not know any details for Aaron, other than that he had raised his own family, he too had lived a whole life before this major turning point.

In short, the two men had already lived an entire life, and were quite possibly expecting a quiet sunset to their lives, yet now they were stepping into their greatest undertaking yet. Moses would live another forty years, thus only a third of his life would be spent leading Israel, but it would be the third that defined the whole.