One factor that has been shown to influence the loss of fluency in the heritage language is age. Studies have shown that younger bilingual children are more susceptible to fluency loss than older bilingual children. The older the child is when the dominant language is introduced, the less likely he/she is going to lose ability in using his/her first language (the heritage language). This is because the older the child is, the more exposure and knowledge of use the child will have had with the heritage language, and thus the heritage language will remain as their primary language.