Osamu Dazai from Bungo Stray Dogs is 22 years old in the present timeline of the series. His birthday is June 19, making him a Gemini

. Additional age references in the series show him at different points in his life:

• 20 years old during the Entrance Exam
• 18 years old during the Dark Era
• 16 years old during the Dragon's Head Conflict
• 14-15 years old in earlier flashbacks

Thus, Dazai's current age in the main storyline is 22 years old.