Marriage Law

In Denmark you can get married when you are 18. In the past a woman could get married when she was 21 and a man could get married when he was 23, but today both women and men can get married when they are 18. If you are under 18 you can get married if you get permission from the authorities. Polygamy is not allowed and if you have been married before you can only get married if you are divorced. You can't marry close family members so marriages between parents and children, marriages between grandparents and grandchildren and marriages between siblings are not allowed.

The only law there is, is that you are not allowed to marry in first blood line. Which means: father not with daughter, mother not with son, brother and sister not together (also not if they are adopted). But.. law can make it difficult if you get married to a foreigner, esp. if women do.

In our country, the allowable age for a couple to get married is aged 18. It is not allowed to marry up to the second degree of affinity and consanguinity.

Well, "legal" (state-recognized) marriage, Yes: that each state controls the laws regarding marriage within it. Some states hold that only heterosexual pairings (couples of two different genders) are valid. I don't know/care about laws regarding age; not to say I want to marry someone below the 'age of consent' (whatever that may be), but more that it doesn't concern me right now.