How do you say I am 23 in Spanish?

In Spanish, you AREn't an age, rather, you HAVE an age. In Spanish, to say "I am 23," you have to say, "I have 23 [years]." That translates to, "Tengo veintitrés [años]." The "I" is understood within the conjugation of the verb. There's only one 'tengo.'

Present tense conjugation of tener, the Spanish verb to have

tengo

tienes / tenés

tiene

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tenemos

tenéis / tienen

tienen