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Why not just believe what the Bible says?

Exactly! Jesus said to "Go and make disciples of all nations" (Greek word there for "nations" is ethne or ethnos ... can't remember which of the two... -- but it's from where we get our word "ethnic")

So Jesus says to go & make disciples of all ethnic groups (IoW, he wasn't just saying to target political boundary countries).

What Jesus didn't say is "Go and make disciples of all ethnic groups, except for the youngest members of those groups -- where you arbitrarily draw a line of outreach exclusion from them because of some unauthorized arbitrary age you attach to them."

Truly I tell you, anyone who will not receive the kingdom of God like a little child will never enter it. -- Jesus, Luke 18:17

18 At that time the disciples came to Jesus and asked, “Who, then, is the greatest in the kingdom of heaven?” 2 He called a little child to him, and placed the child among them. 3 And he said: “Truly I tell you, unless you change and become like little children, you will never enter the kingdom of heaven. 4 Therefore, whoever takes the lowly position of this child is the greatest in the kingdom of heaven. 5 And whoever welcomes one such child in my name welcomes me.

- Jesus, Matthew 18