You get a renewal reminder in the mail prior to the actual expiration date, and can go to renew the licence at any time. It is illegal to be driving without a licence, and I believe that you can still be ticketed. There is no excuse for not renewing your licence. It can even be done out of province/country, if you happen to not be here when the expiry date comes up.
"Never give a match up halfway through. Never say that you do not feel up to it, that your condition is bad, and throw in the towel. Fight to the very end, always looking for your chance to break through." - Kazuzo Kudo