Rick Sanchez is stated to be 70 years old as of season 3.
The age reference comes from season 3, episode 6, “Rest and Ricklaxation.” Toxic Rick says he has been bottled up inside Rick’s mind for 70 years, which establishes the commonly cited age for the character. Reference summaries therefore list Rick as 70 years old in season 3.
The wording has a small qualification: the episode’s dialogue most precisely supports Rick being at least 70, rather than proving that 70 is his exact birthday-defined age. The series uses a flexible cartoon timeline, and Rick’s history spans multiple dimensions, so the show has never supplied a conventional birth date.
That uncertainty explains why fan discussions sometimes describe Rick as “at least 70” or debate whether the number is rounded. Nevertheless, for a season-3 trivia question with 70 as the intended choice, 70 is the canonical quiz answer. The figure should not be confused with Morty’s age, which is generally given as 14.