how old can canadian money be and still be accepted?

Answer 1

money really never goes out of style -- it may be come a collector item -- if in doubt there are plenty of internet sites that can tell you if you have collectors money or not!!!

Answer 2

I think that any money is money. It will still be accepted no matter what year it has on it.
here is a website that might help:
http://www.colonialacres.com/bocitems.shtml
http://www.mint.ca/royalcanadianmintpublic/index.aspx?requestedPath=/en-CA/Home/default.htm
I work in retail, and I accept all coins and bills no matter what. If people want to spend their old coins/bills, I take them, then look through them, and exchange the old coins for newer ones of my own.
I am not a collector, per se, but if I see something unusual, I do like to exchange it for my own money.
hope that helped a little