Pre-K, or pre-kindergarten, is generally designed for children aged 4 to 5 years old, serving as a preparatory year before they enter kindergarten

. It typically focuses on more structured learning and kindergarten readiness skills, such as pre-reading, writing, math, and social-emotional development

. While preschool can include children as young as 2.5 or 3 years old, pre-K is specifically for the year before kindergarten and is often more academically focused

. In summary:

• Preschool age range: about 2.5 to 4 years old
• Pre-K age range: generally 4 to 5 years old, the year before kindergarten

Pre-K programs may be optional and vary by state or school district, but they aim to prepare children for the transition to kindergarten