In the first season of Grey's Anatomy, Alex Karev is 27 years old. This is revealed in the episode "Who's Zoomin' Who?" when Karev asks Meredith Grey her age and then states his own.
This information is crucial to understanding Karev's character development throughout the series. He is a young and ambitious surgeon, still learning the ropes of his profession and navigating the complexities of the medical field. His age also plays a role in his relationships with other characters, particularly his romantic interests and his friendships.
