As you are likely aware, if you do not exit out of the Ontario, Canada Graduated Licensing Program within 5 years, or take a test to retain your current class, your license will expire. This is 5 years after the date you received your original G1 licence.
In Ontario, insurance companies typically will allow you to insure your vehicle as the principal driver with a G2 license. You can get more information regarding insurance in your area as well as an