Translating I am the youngest in the family

Hello all, this is an example from Duolingo, but for whatever reason the linked discussion has been locked.

There is an example where a boy/girl is saying "I am the youngest in the famliy". The translation seems to be "Yo soy él/la mas joven de la familia"

I thought that when using a superlative type of structure, for the male, one might say "Yo so lo mas joven de la familia". Is this incorrect? Does it apply in other cases, maybe that don't involve talking about humans?

edit: typo

submitted by /u/PMull34
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