Conrad is 17 years old in Season 1 of The Summer I Turned Pretty and turns 18 around the holidays in the show. In the books, he turns 18 at the beginning of summer. So during the summer depicted in the story, Conrad is either 17 or just turning 18 depending on whether you refer to the show or the books
. In summary:
- In the show, Conrad is 17 during Season 1 and turns 18 around the holidays.
- In the books, he turns 18 at the start of summer.
This means during the summer in which most of the story takes place, Conrad is about 17 or just turning 18.