viejo

In a sentence

• Mi abuelo es muy viejo.

  My grandfather is very old.

  Here, 'viejo' is an adjective describing the advanced age of the speaker's grandfather.

• Hace mucho que no veo a mi viejo amigo Juan.

  I haven't seen my old friend Juan in a long time.

  In this sentence, 'viejo' means long-time, referring to the extended duration of the friendship.

• ¿Viste ese carro viejo en el garaje?

  Did you see that old car in the garage?

  Here, 'viejo' is used to describe the car, suggesting it's been around for a long time or is worn out.