At least 18 years of age

In Finland, a person becomes an adult when he or she turns 18 years of age. You may apply for Finnish citizenship if you have turned 18.

If you are married, you may apply for Finnish citizenship even if you are not yet 18 years of age.

If you wish to apply for Finnish citizenship for a child who is younger than 18, you can find more information on the page "Citizenship for a child".