In Illinois all persons who are at least 12 years of age and less than 16 years of age are required to take a Illinois-Approved Snowmobile Safety Course, and obtain a snowmobile safety certificate when riding on public lands. Riders under the age of 12 are not required to carry a certificate, however these riders MUST be accompanied (on the same snowmobile) by a parent or guardian of at least 18 years of age at all times when riding in public areas.