Usage Note
Dieciocho is written as a single word, like dieciséis and diecisiete. In Spain and Latin America, 18 is the legal age of majority, so cumplir dieciocho carries the cultural weight of reaching adulthood. Note that unlike dieciséis, this word bears no written accent because stress falls on the penultimate syllable, which is the default.
Examples
"Cumplirá dieciocho años en marzo."
Natural Translation
She will turn eighteen in March.

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