from twenty

Numbers 14:28, 29
So tell them: As surely as I live, declares the LORD, I will do to you exactly as I heard you say. . . .

Numbers 26:2, 64, 65
"Take a census of the whole congregation of Israel, those twenty years of age and older, by the houses of their fathers--all who can serve in the army of Israel." . . .

Deuteronomy 1:35
"Not one of the men of this evil generation shall see the good land I swore to give your fathers,

Deuteronomy 2:14, 15
The time we spent traveling from Kadesh-barnea until we crossed over the Brook of Zered was thirty-eight years, until that entire generation of fighting men had perished from the camp, as the LORD had sworn to them. . . .

because

Numbers 14:24, 30
But because My servant Caleb has a different spirit and has followed Me wholeheartedly, I will bring him into the land he has entered, and his descendants will inherit it. . . .

Joshua 14:8, 9
Although my brothers who went with me made the hearts of the people melt with fear, I remained loyal to the LORD my God. . . .

wholly followed me.