Ajay Devgn celebrates his 55th birthday today and was spotted at Kalina airport, seated inside his car with his son Yug. On his birthday, Kajol shared a humorous yet affectionate post on Instagram, featuring a beautiful photo of Ajay and a note about his reaction to birthday cake thoughts. Ajay Devgn Spotted at Kalina Airport on His 55th Birthday With Son Yug (Watch Video).