Learn Spanish (Latin America): Tienes muchas canas, pero llevamos treinta años sin vernos. - You have a lot of gray hairs, but we haven't seen each other in thirty years.

This sentence uses the structure llevar (conjugated) + [amount of time] + sin + [infinitive]. Literally, it means "we carry thirty years without seeing each other." While English uses a negative present perfect tense ("we haven't seen"), Spanish commonly uses this llevar structure in the present tense to express how much time has passed since an action last happened.

Why is nos attached to the end of ver to make vernos?

The nos here is a reciprocal pronoun meaning "each other." Because the verb follows the preposition sin (without), ver must remain in its infinitive (unconjugated) form. In Spanish, object and reciprocal pronouns are attached directly to the end of infinitives.

Why is it sin vernos and not sin viéndonos? Doesn't English say "without seeing"?

In English, prepositions are often followed by an "-ing" verb. However, in Spanish, prepositions like sin (without), para (for), and de (of/from) are always followed by the infinitive form of the verb (ver), never the -ndo form.

Why does the sentence use muchas canas instead of something like "mucho pelo gris"?