The degree to which adoption impacts on children differs according to the age they are when this happens. Although all circumstances are individual, the impact tends to be greater when the child is older, especially if the adoptive parent or parents were not known to them before. Nevertheless, toddlers and babies are also affected because they may start to wonder about their biological parents as they get older. Most trauma tends to be associated with children who are not told they have been adopted but discover the truth as they get older.