While checking in today in YUL, I was told that the age to sit in the exit row was 16. I therefor could not sit in it, according to the agent. I find this extremely weird, as the agent in PHX said it was 15, and gave me the exit for the ORD-YUL flight. Why would the YUL agent say that one needs to be 16 years old? I have always believed that the rule is 15 years old. Any help is appreciated!