Kids typically start kindergarten at about 5 years old. Most states in the U.S. require children to be 5 by a specific cutoff date—usually around August or September—before starting kindergarten in the fall. Some children may start at age 4 if their birthday is close to the cutoff, and some turn 6 shortly after starting kindergarten, depending on the birthdate and local rules. It is important to check the specific age cutoff date for the school district, but generally, kindergarten entrance age ranges from 4 to 6 years old, with most children being 5 at the start of kindergarten. Additionally, emotional and academic readiness are also considered important alongside age when starting kindergarten. In summary:

• Typical starting age: 5 years old
• Age range: 4 to 6 years old, based on cutoff dates and district policies
• Cutoff dates vary, often August 31 or September 1
• Some parents may delay entry for developmental reasons ("redshirting")

This age ensures children are socially, emotionally, and academically prepared for school.