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I too was expecting a minor child, not a young-ish adult.

I don't feel like checking it now but Linus was pretty young too when he released his kernel.

Yep; Linus Torvalds born 1969 would have been ~22 years old when Linux was first released in 1991. -- https://en.wikipedia.org/wiki/Linux & https://en.wikipedia.org/wiki/Linus_Torvalds