How to Say "adult" in Spanish
The most common Spanish word for “adult” is “adulto” — use 'adulto' when referring to a grown-up person in a general sense, often in formal contexts like signing documents..
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
/ah-DOOL-toh//aˈðul.to/

Examples
Este programa tiene contenido adulto, no es para niños.
This program has adult content; it is not for children.
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.
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).
mayor
/mah-YOR//maˈʝoɾ/

Examples
Tienes que ser mayor de edad para votar.
You have to be of legal age to vote.
Cuando seas mayor de edad, podrás conducir solo.
When you are of legal age, you will be able to drive alone.
Debemos cuidar a nuestros mayores.
We must take care of our elders.
Hay un descuento para mayores en el museo.
There is a discount for senior citizens at the museum.
Using 'Los' or 'Las'
When used as a noun, you'll almost always see it with an article like 'los mayores' (the elderly people/men) or 'las mayores' (the elderly women).
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.
mayor
/mah-YOR//maˈʝoɾ/

Examples
Debemos cuidar a nuestros mayores.
We must take care of our elders.
Tienes que ser mayor de edad para votar.
You have to be of legal age to vote.
Cuando seas mayor de edad, podrás conducir solo.
When you are of legal age, you will be able to drive alone.
Hay un descuento para mayores en el museo.
There is a discount for senior citizens at the museum.
Using 'Los' or 'Las'
When used as a noun, you'll almost always see it with an article like 'los mayores' (the elderly people/men) or 'las mayores' (the elderly women).
Adulto vs. Grande
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