Usage Note
Diciottenne means eighteen years old and is invariable for gender — uno/una diciottenne (an eighteen-year-old boy/girl). It can function as both an adjective and a noun. In Italy, eighteen is the age of majority (la maggiore età), so diciottenne often carries the connotation of a legal adult or a new voter casting their first ballot.
Examples
"Mia sorella è diciottenne."
Natural Translation
My sister is eighteen years old.

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