Do the sentences below sound natural?
I have a brother and a sister. He's 16 and she's 14.
Or should you say, 'My brother is 16 and my sister is 14.'?
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There are many ways of saying siblings' ages.
All of the above are grammatically correct. The second example is a longer version than the first, but the OP's original sentence sounds more natural because it contains contractions. Just be careful though to never make these typical Italian learners mistakes:
I have a brother and a sister. He has 16 years and she has 14 year * = NO!