How old must I be to become a lifeguard?
Even if you need to be only 16 years old when you take a National Lifeguard course, the Regulation respecting safety in public baths (B-1.1, r. 11) requires lifeguards to be at least 17 years old and to hold a National Lifeguard award that is no more than 2 years old.
You can also become assistant-lifeguard at 15 years old if you have a Bronze Medallion award.