The typical age for children in 1st grade is usually between 6 and 7 years old. Most children enter 1st grade after completing kindergarten, generally at age 6, and turn 7 during the school year. This is consistent across many regions, though exact ages can vary slightly depending on school district cutoff dates and local regulations. In summary, children in 1st grade are commonly 6 years old at the start and 7 years old by the end of the year.