The age at which kids go to school varies depending on the state and the type of school. Here is a summary of the information found in the search results:

• In California, children who turn five years old on or before September 1 are eligible to attend kindergarten at the beginning of the school year.
• In California, school is mandatory for six-year-old students, and parents and guardians must enroll their children in school once they reach the age of six.
• In California, younger five-year-olds can go to transitional kindergarten (or TK) for one year. They go to kindergarten the next year. This gives them extra time to grow and mature, so they are more like their classmates.
• In the United States, the law requires all children to go to school. Children begin elementary school with kindergarten (grade K) around age 5. The next year is grade 1 and it goes up each year to grade 5. They finish elementary school around age 10.
• The ages of the students for each grade can vary from state to state. For example, in the state of Washington, students can start kindergarten if they’re 5 years old before August 31, but they don’t have to — parents have until age 8 to start their kids off in public school.
• In some states, children must be between the age of 4 and 6 to attend kindergarten.

In summary, the age at which kids go to school varies depending on the state and the type of school, but most children start elementary school with kindergarten around age 5.