Okay I read all the Illinois regs and then sent a question to the Ask a Warden as I posted.

this is what I got in return,
I asked
At what age can a hunter hunt alone?

Do you have a minimum age to hunt?

The Response ~ Quote
No minimum age. They can hunt alone after passing the required hunter safety course and securing a foid card.



Conservation Officer Pickett 276
IDNR Law Enforcement
One Natural Resources Way
Springfield, IL 62702

End Quote