But in the bible only those under 20 lived to march into the Promised Land. Everyone else except Joshua and Caleb and a few others died and did not enter.
(Numbers 32:10-14) 10 Consequently Jehovah’s anger blazed on that day so that he swore, saying, 11 ‘The men who came up out of Egypt from twenty years old upward will not see the soil of which I have sworn to Abraham, Isaac and Jacob, because they have not followed me wholly, 12 except Ca′leb the son of Je·phun′neh the Ken′iz·zite and Joshua the son of Nun, because they have followed Jehovah wholly.’ 13 So Jehovah’s anger blazed against Israel and he made them wander about in the wilderness forty years, until all the generation that was doing evil in the eyes of Jehovah came to their end. 14. . .