You must be at least 18 years old to apply Canada PR. You get points for age factor up to the age of 46 years. However, with the increase in age, your points start decreasing. You get maximum points for age factor when you are in age group 18-35
English and French are the two official languages of Canada. Hence, as an applicant of Canada PR, you must prove your proficiency (minimum CLB 7) in one of these languages. You need to provide Language proficiency test result from an approved language testing agency, such as, IELTS for English proficiency.
You must be at least graduate to apply Permanent Residency in Canada. Also, if you are applying for Canada PR as a skilled worker from an overseas country, you need to provide ECA (Educational Credential Assessment)from approved authority, such as WES, so that IRCC can verify your qualification obtained from outside Canada.
To apply Canada PR, you must have at least 1 years of work experience. However, to get invitation to apply for Canada PR from IRCC, you must earn high enough points on the point based immigration system of Canada. Hence, work experience of at least 3 years can help you earn good points.