http://www.mto.gov.on.ca/english/dandv/driver/senior/renewal80.shtml said:
Once you reach 80 years of age, your driver's licence will be renewed every 2 years instead of every 5 years. You will have to go through a different process to renew your licence.
To renew your licence you will have to attend a driver's licence renewal session with other senior drivers. At this session, you will:
* Have your vision tested — to learn more, go to the vision section below
* Take a multiple-choice test on traffic rules and signs — to learn more, go to the test section below.
* Participate in a group education session — a ministry counsellor will teach a small group of seniors about how aging affects driving, tips on driving and new traffic laws (lasts about 90 minutes) — to learn more, go to the group education section below.