In the United States, 9th grade is the first year of high school, and students are usually 14 to 15 years old. However, some students may be older if they were held back, moved forward, or had their birthday during the 9th grade year. In other countries, the age range for 9th grade may vary. For example, in Sweden, students are usually 15-16 years old in 9th grade. In Afghanistan, 9th grade is the third year of secondary school, which starts in seventh grade, and students are generally around 15 years old. In India, 9th grade is the first year of high school, and students are generally ages 14 to 15. Its important to note that educational systems vary by country, so the age range for 9th grade may differ depending on the location.