According to the script for the pilot episode, obtained by Deadline, Anthony (Jonathan Bailey) is 28 when the show begins, which makes him 29 in season two. This tracks with the flashbacks this season in which viewers learn that Anthony was nearly an adult when his father died. The youngest Bridgerton sibling, Hyacinth (Florence Hunt), was born shortly after the family's loss. She's about 11 years old in season two, placing Anthony firmly in his late teens at the time of his father's death.