How to Say "mature" in Spanish
The most common Spanish word for “mature” is “adulto” — use 'adulto' when referring to content, themes, or behavior that is intended for or characteristic of adults, implying a lack of suitability for children..
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.
Ella tomó una decisión muy adulta sobre su futuro.
She made a very mature decision about her future.
Necesitamos tener una conversación adulta sobre este problema.
We need to have a grown-up conversation about this problem.
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).
desarrollado
/deh-sah-rro-yah-doh//desaroˈʝado/

Examples
El atleta tiene los músculos de la espalda muy desarrollados.
The athlete has very well-developed back muscles.
Es una idea poco desarrollada todavía.
It is still a poorly developed idea.
vencer
ven-SER/benˈθeɾ/

Examples
La fecha límite para entregar el informe vence mañana.
The deadline for submitting the report expires tomorrow (is due tomorrow).
Mi pasaporte venció el mes pasado, necesito renovarlo.
My passport expired last month; I need to renew it.
El contrato vence en diciembre.
The contract runs out in December.
Using 'Vencer' for Dates
In this sense, 'vencer' is often used impersonally, meaning the date or document itself is the subject doing the expiring: 'El plazo vence' (The deadline expires).
Confusing 'Vencer' and 'Terminar'
Mistake: “Using 'terminar' for an expiration date, like 'El pasaporte terminó'.”
Correction: 'Terminar' means something simply finished. 'Vencer' specifically means a validity period or deadline has run out due to a predetermined date: 'El pasaporte venció'.
Adulto vs. Desarrollado
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