On PEI, you must be 18 years old to get married unless you have permission from your parents or from a court. No one under the age of 16 can get married.
In Canada, it is illegal to be married to more than one person at a time. It is also illegal to marry people closely related to you, such as a sibling or half-sibling (biological or adopted).
Both people must be mentally competent and able to understand the full consequences of marriage. If one person is not competent, the marriage cannot go forward. Mental competency is a medical decision, determined by doctors.
Same-sex marriage is legal in Canada and same-sex spouses are subject to the same rights and responsibilities as heterosexual spouses when it comes to marriage and the law.