Tú or Usted?

Tú is the standard you for people under thirty, colleagues, family and lovers.

Usted is used to address older people, ranking individuals in professional and social hierarchies, political and religious dignitaries, business acquaintances and individuals whom you prefer to keep at bay.

To avoid an unwelcome familiarism, wait until you are invited to use tú. The verb tutear is used for such occasions, as in ¿nos tuteamos?