Could you please check this sentence for me?

I am interested in student writing exchanges but my students are in first grade.
How old are first-grade students? (This is a real question)

The phrasing "student writing exchanges" may or may not be understood, depending on whom you're writing to. The casual term is "pen pals" but, again, that may or may not be easily understood.

First-grade students in the US are usually 6 or 7 years old.

im english

To determine the age range of first-grade students, we need to know the typical starting age for first grade in your country. In most countries, first grade typically starts around the age of 6 or 7.

To verify the appropriate age range for first-grade students in your country, you can consult educational guidelines, school district policies, or official curriculum documents. These resources will provide specific information on when children typically enter first grade and the corresponding age range. Additionally, you can reach out to local schools or educators for confirmation.

Once you have confirmed the starting age for first grade, you can easily determine the age range for first-grade students.