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post puberty boys have absolutely have overlap with over 18 adults, if for no other reason then kids can go through puberty at different ages, so some 18 years olds have voices that are just dropping while others have had their voice drop for 6+ years.

You aren't going to be able to find a set of signatures that keeps out a useful number of <18s that doesn't also flag >18s

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You are correct with inferring it's a scale, completely.

Politely disagree with "You aren't going to be able to find a set of signatures that keeps out a useful number..."

That's AGEWARDEN's job and the last year of my life has been diving deep into audio data to find those exact signals.

Good call out and thank you for the pushback :)

What do you consider the appropriate false negative/fall positive rate for voices of people aged 16-20? Since you don't give a confidence rating to the determination it's on the service to figure out what it's comfortable with.

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