The legal minimal mariage age doesn't mean it's the avarage age someone does marriage, in Europe the country that has the lowest avarage is Belarus with 27.1, in the Americas it's Nicaragua with 22.5, i could continue but it's basically 21/22 for all the others

Edit: the lowest age of mariage in all continents* avarage is 23.15

*except oceania, wikipedia has only the median so i excluded it because otherwise it would be wrong