 According to an analysis of Ida's cratering processes, its surface is more than a billion years old.However, this is inconsistent with the estimated age of the Ida–Dactyl system of less than 100 million years; it is unlikely that Dactyl, due to its small size, could have escaped being destroyed in a major collision for longer.The difference in age estimates may be explained by an increased rate of cratering from the debris of the Koronis parent body's destruction.