Stallman, June 2024:
Please do not use the word “children” or “child” to refer to anyone under age 18. A 17-year-old is not a child. A 13-year-old is a teenager.
https://www.stallman.org/archives/2024-mar-jun.html#16_June_2024_(Online_addictive-feeds_law,_NY)
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(He has reiterated this idiolectical definition of "child" dozens of times since 2019 and dozens of times prior to 2019)