What is Groot's weakness? His Weakness Is Termites. We're meant to believe that Groot transcends the laws of nature by absorbing wood
How old is Groot? In Guardians of the Galaxy: 25 years old, 1 years old at the end. In Guardians of the Galaxy Vol. 2: 5 years old, 18 in a mid-credits scene. In Avengers: Infinity War: 18 years old.