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/Sounds like 'treh-een-tah-NYEH-roh'/

Someone in their thirties — typically said with a mix of humor and mild existential crisis. In Spanish-speaking countries treintañero captures that specific life stage where you're not exactly young anymore but definitely not old, and everyone around you is getting married or going through a phase.

Example

"Ya somos treintañeros, se acabó la vida loca. → "We're in our thirties now — the crazy life is over."

"Los treintañeros de hoy son muy distintos a los de antes. → "Thirty-somethings today are very different from those of the past."

Regional synonyms:

Persona tonta, ingenua o que siempre sale perdiendo en todo. En España se usa para alguien que se deja engañar o que hace el ridículo sin darse cuenta.