It states a number of requirements to a married couple if they want a permanent residence in Denmark.
It is meant to cut down forced marriages and family reunification immigration.
[3] The rule is supported by all major political parties in Denmark except Enhedslisten.
[4] Some Danish politicians have advocated increasing it to 28 years of age.
[5][6] Also advocated by the Progress Party in neighbouring country Norway, centre-right parties agreed to implement the rule there in 2014.