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When I immigrated to Canada the process was rather arduous, and the categories under which you could immigrate were quite restricted. It depends on your skills, your age, your finances, your family (if any) in Canada, which employment categories Canada is prioritizing, and so on. There’s information here for anyone considering it:
https://www.canada.ca/en/immigration-refugees-citizenship/services/immigrate-canada.html
And a questionnaire to find out whether you’re eligible to apply to immigrate to Canada:
https://onlineservices-servicesenligne.cic.gc.ca/c2c/
Also, for Express Entry the age limit is 55. Not sure what PR pathways exist for those older.
Though, while not permanent, theoretically you can just keep renewing a work permit under NAFTA. There’s no age limit to the permit, so as long as you’re able to work (and you have a qualifying employer and meet other requirements) you should be able to do this to stay in Canada indefinitely.