Definition: "4.1.21" is a specific biblical reference to the age of maturity for Israelites in 1 Kings 5:6-8, where the people are expected to be old enough to pass through the Red Sea without drowning and still carry on with their lives under God's protection. The passage also suggests they should be matured spiritually, justifying the time to enter a certain area of the desert (which is typically a wilderness or wilderness areas) before entering another place like Canaan.