Answered here:

    Questions About Eligibility for, and Denial of Firearms Licenses in Canada

    How old do I have to be to get a Firearms License in Canada?

    You must be at least 18 years old to apply for a firearms Possession and Acquisition (PAL) License in Canada.

    It is possible for some people under 18 to obtain a special minors license in some cases to borrow firearms for certain lawful uses, such as hunting. However, since it is possible for minors to use firearms under the direct and immediate supervision of a licensed person, these licenses are fairly rare.

    Will they deny my application?

    I don't know. But if you feel there might be some reason that they would, I strongly recommend you call the RCMP CFP at +1 (800) 731-4000 (Monday to Friday, 9:00am – 5:00pm) and ask them in advance.

    Please, do not send me questions asking if you will be denied.

    What if I have a criminal record?

    Criminal records can include many things, there's a lot gradation in severity between being thrown in the drunk tank and committing a murder. If you think you might have anything in your record I recommend you call the RCMP CFP at +1 (800) 731-4000 (Monday to Friday, 9:00am – 5:00pm) and ask them in advance.

    Can I apply if I'm being treated for mental illness?

    There are questions about your mental health under Section C on the application form and you must answer them truthfully. Not everyone with mental illness is a danger to themselves or others. If you suffer from any kind of mental illness you may wish to include a professional statement from your medical provider indicating that they do not object to your application.

    Do I need to be a citizen or resident of Canada?

    No. I have answered this question in a fair bit of detail on another page. You can skip right to the answer.

    What if my ex husband, wife, or conjugal partner objects?

    Don't get your hopes up. The CFO has a duty to notify them of your application if they do not sign your application form. It's not just your ex, anyone may raise a public safety concern about someone's application, and those concerns are taken very seriously.