In the United States high school seniors are 17-18 years old. High school students usually begin senior year at 17 years of age and are 18 years old during the school year or just after the school year ends. Senior year of high school is also considered 12th grade and it is the fourth (and final) year of high school in the United States.
Below is a table that identifies the ages of students in grade levels kindergarten to 12 grade in the United States.
| Grade Level | Age |
| Kindergarten | 5-6 |
| 1st | 6-7 |
| 2nd | 7-8 |
| 3rd | 8-9 |
| 4th | 9-10 |
| 5th | 10-11 |
| 6th | 11-12 |
| 7th | 12-13 |
| 8th | 13-14 |
| 9th (high school freshman) | 14-15 |
| 10th (high school sophomore) | 15-16 |
| 11th (high school junior) | 16-17 |
| 12th (high school senior) | 17-18 |
What Is After High School?
After high school students are considered adults and will decide whether to continue their education or enter the workforce.
Allen is an 8th grade teacher in a public school district in a Chicago suburb.