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If the idea of an "age of accountability" is not in the Bible, then where does it come from?

Well, it's a scientific fact that children develop in a certain way. When they are young, they absorb everything around them, and believe everything you say to them.. whether it's true or not. It's not til later.. around 8ISH.. it's different for all children.. but that's when they begin to reason things out. Gill says:

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This is from Gill's "of the Respective Duties of Parents and Children"
and to learn them from childhood to read and know the holy scriptures, according to their capacity; and by these to be "admonished" of sin, and of their duty, to fear God, and keep his commandments; which may be meant by the "admonition of the Lord"; and the proper opportunity should be taken to instil these things into their minds, when their minds begin to open, and they are inquisitive into the meaning of things; (see Deut. 6:20)



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Deut. 6:20 "When your son asks you in time to come, saying, 'What is the meaning of the testimonies, the statutes, and the judgments which the Lord our God has commanded you?'

Michele