A Canadian passport is the internationally accepted evidence of your Canadian citizenship, as well as providing the best possible photo identification. A standard adult passport is valid for 5 years as are passports for children aged 3to15. For children under 3 years old, the maximum validity of a passport is 3 years. As passport applications take longer to process during peak times, we suggest that you try to apply for your passport during the off-peak season between June and Nov.