The age at which you need a fishing license varies by state. In Indiana, residents and nonresidents under age 18 are exempt from needing a fishing license. In Illinois, anglers who are under the age of 16, blind or disabled, or residents on active military service are exempt from needing a fishing license. In Oklahoma, a fishing license is required for residents over 16 years of age, or 14 if theyre not a resident. Its important to note that some states have different licenses for different people, such as discounted or free licenses for minors, veterans, seniors, and the disabled. If you plan to accompany a child and teach them to fish, but you are not fishing, then some states require you only to buy a license for the child.