On the application it says
"You must have met any applicable requirement under the Income Tax Act to file income taxes for four (4) taxation years that are fully or partially within the six (6) years immediately before you apply"
I started working at the age of 18 and i am 20 now. So i filed tax for only 2 years.
Not enough information to say for sure. If you didn't have to file because you didn't have enough income or for some other reason in the two years you didn't file then you are probably fine.
Not enough information to say for sure. If you didn't have to file because you didn't have enough income or for some other reason in the two years you didn't file then you are probably fine.