Translation:I am an adult.
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Because "dorosły" is being used as an adjective.
Take a look at https://forum.duolingo.com/comment/16373167/A-guide-on-X-is-Y-and-This-is-Y-constructions, and in particular, Part 3 of thereof.
I typed "I am an adult man" because the prior example was this exact phrase in English. I understand perfectly that this translates to I am an adult and the ending is masculine but in terms of the exercise you may want to add "I am an adult man" to be consistent with the exercises.
We don't have the power to make a specific voice say a specific sentence. It's best to think of every audio as someone just reading a sentence. After all if you read a sentence out loud it doesn't matter if it applies to you (even grammatically) or not.
Obviously a woman would say "Jestem dorosła".