I am not aware of any minimum age requirement, except that some special youth hunt programs may have a minimum age of 10yrs. Generally, as long as they can understand and successfully complete the hunter safety course, they are good to go. All my kids took the hunter safety course at 9 or 10 and started hunting then. My youngest killed his first deer during the Youth Deer Season 2 years ago at age 9.

I help with a hunter safety course each year and we always have some 8 and 9 year olds in the class.