What I've gotten from BankofCanada site is,eemmoo1 said:It would be wise to change ur old with new ones and u can see from link below they are in process of changing notes of different denominations.
http://www.bankofcanada.ca/banknotes/
http://www.bankofcanada.ca/banknotes/bank-note-series/
1. Are my paper bank notes still legal tender?
All notes issued by the Bank of Canada since 1935 have legal tender status and retain their full value. If you don’t know how to check notes from past series, exchange them for newer ones at your local bank.