9 "But you shall surely kill him; your hand shall be first against him to put him to death, and afterwards the hand of all the people. Deuteronomy 13:9
Did all the people included minors?
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The Israelites held roughly to an 'age of consent'. Basically You were under your father's household until you left and started your own family (see Matt 19:5, Eph 5:31, Gen 2:24 etc). It was sufficient for each family to be represented in the process (either father or older brother).
The 'modern' idea of personal independence and individualism is a Greek idea, and not a Hebrew one. So NO - children were not expected to participate since they were represented by their family's participation.