It sounds like you want to know how old someone typically is in a certain grade. Here’s a quick guide for the usual ages in each grade in the United States:
- Kindergarten: 5–6 years old
- 1st Grade: 6–7 years old
- 2nd Grade: 7–8 years old
- 3rd Grade: 8–9 years old
- 4th Grade: 9–10 years old
- 5th Grade: 10–11 years old
- 6th Grade: 11–12 years old
- 7th Grade: 12–13 years old
- 8th Grade: 13–14 years old
- 9th Grade (Freshman): 14–15 years old
- 10th Grade (Sophomore): 15–16 years old
- 11th Grade (Junior): 16–17 years old
- 12th Grade (Senior): 17–18 years old
If you want to know the age for a specific grade, just let me know!