| Student Age Group | Number | Percent |
|---|---|---|
| 20-21 | 8,219 | 39.54% |
| 18-19 | 6,456 | 31.06% |
| 22-24 | 3,574 | 17.20% |
| 25-29 | 1,187 | 5.71% |
| 35 and over | 851 | 4.09% |
| 30-34 | 426 | 2.05% |
Most Illinois State students fall into the 20-21 age-range. Student age diversity is considered average.