How to Say "grown-up" in Spanish
The most common Spanish word for “grown-up” is “adulto” — use 'adulto' when referring to a person who has reached maturity and is legally considered an adult..
adulto
/ah-DOOL-toh//aˈðul.to/

Examples
Necesitas ser un adulto para firmar este contrato.
You need to be an adult to sign this contract.
La entrada para los adultos cuesta diez euros.
The ticket for the adults costs ten euros.
Cuando era niño, pensaba que ser adulto era fácil.
When I was a child, I thought being a grown-up was easy.
Este programa tiene contenido adulto, no es para niños.
This program has adult content; it is not for children.
Gender Matching for Nouns
Remember that 'adulto' is masculine, used for men or when talking about a group that includes both men and women. If you are specifically talking about a woman, you must use 'adulta'.
Adjective Agreement
As an adjective, 'adulto' must change its ending to match the thing it describes in number (singular/plural) and gender (masculine/feminine). For example: 'temas adultos' (adult topics, plural masculine) or 'actitud adulta' (adult attitude, singular feminine).
Confusing Noun and Adjective
Mistake: “Using 'adulto' to describe a feminine noun without changing the ending (e.g., 'una mujer adulto').”
Correction: The adjective must match the noun: 'una mujer adulta' (a grown-up woman).
adulto
Examples
Este programa tiene contenido adulto, no es para niños.
This program has adult content; it is not for children.
grande
/GRAHN-deh//ˈɡɾande/

Examples
Cuando sea grande, quiero ser médico.
When I'm grown-up, I want to be a doctor.
Mi hermano grande vive en otra ciudad.
My older brother lives in another city.
Ya eres grande para creer en fantasmas.
You're too old/grown-up to believe in ghosts.
Adulto vs. Grande for 'grown-up'
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