When Baby Yoda first appears in 'The Mandalorian', his age is not specifically mentioned. However, according to interviews with the show's creators, it is believed that Baby Yoda is around 50 years old during the events of the show. This is due to Yoda's species having a very long lifespan, with Yoda himself living to be over 900 years old. Therefore, even at 50 years old, Baby Yoda is still considered to be an infant in his species.