The age at which kids start preschool can vary depending on the childs individual readiness level and the preschools entry criteria. However, most preschools consider an appropriate age to be around three to four years old. Some preschools may enroll children as young as 2.5 years old, while others may start at four years old. The Center for Disease Control and Prevention defines the preschool age range as being between three and five years old. Its important to note that preschool readiness depends on more than just age, and every child develops at their own pace. Factors to consider when determining preschool readiness include separation anxiety, social development, potty training, physical development, nap necessity, persistence, curiosity and imagination, communication skills, and listening skills.