Snow White is the princess who is 14 years old.
According to Disney canon, Snow White was only fourteen years old in the classic film "Snow White and the Seven Dwarfs." She is known for her kindness and naivete, characteristics often associated with her youth. Her story revolves around escaping the Evil Queen and finding refuge with the Seven Dwarfs.
Therefore, the answer to the question, "Which princess is 14 years old?" is definitively Snow White.
