How to Say "matured" in Spanish
The Spanish word for “matured” is “vencido” — B2 level. This is a very common word in everyday Spanish.

Examples
Tenemos que pagar la renta antes de que esté vencida.
We have to pay the rent before it is overdue.
El plazo para entregar los documentos está vencido.
The deadline for submitting the documents has expired.
Me di cuenta de que mi pasaporte estaba vencido.
I realized that my passport was expired.
Time vs. Food
In Spanish, 'vencido' usually refers to deadlines, contracts, or official documents. For food or medication that has gone bad, it is often more natural to use 'caducado'.
Using 'Ser' vs. 'Estar'
Mistake: “Mi pasaporte es vencido.”
Correction: Mi pasaporte está vencido. Use 'estar' because expiration is a temporary state or condition of the object, not a permanent characteristic.
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