Calculate 7 pm Sydney time to what time it was in Greenwich, England at that time then do the same with Vancouver, whichever was earlier is older. Greenwich is where the time zones kind of "start" if you get what I mean.
In Canada, you can drink at 19 (18 in Quebec).... one year is hardly a screwing. And we have better beer.... it's worth the wait! Or get a fake ID, like I did.
I say cut one of their arms off on each of them and count the rings.