Denmark was the first state to recognize a legal relationship for same-sex couples, establishing "registered partnerships" very much like marriage in 1989.
In 2001, the Netherlands became the first nation in the world to grant same-sex marriages.
Same-sex marriages are also granted and mutually recognized by:
Belgium (2003)
Spain (2005)
Canada (2005)
South Africa (2006)
Norway (2009)
Sweden (2009)
Portugal (2010)
Iceland (2010)
Argentina (2010)
Denmark (2012)
Brazil (2013)
France (2013)
Uruguay (2013)
New Zealand (2013)
In Mexico (2013), same-sex marriage is recognized in all 31 states but only performed in Mexico City and in Quintana Roo State.
In the United States (2013), thirteen states and the District of Columbia permit same sex marriage, beginning with Massachusetts in 2004 and Connecticut in 2008.
The Netherlands was the first country in the world to legalize same-sex marriage in 2001. Same-sex marriage was first legalized in the USA in the state of Massachusetts on May 17, 2004.
The answer to that question depends upon where you live. In many places in the world it has already been legalized, although in most places it has not. The rate at which new places legalize it seems to be accelerating, with 2013 being the top year so far. The truth is that same-sex marriage is probably inevitable in all of North America, most of South America, and most of Europe and Oceania. There is almost no progress being made in Asia and Africa.
If by "illegal" you mean "against the law," then none. There is no state in the US where same-sex marriage is considered a crime. In fact, in most US states, same-sex marriage is legally recognized. (See related questions below: "What US states have legalized same-sex marriage" and "What US states have banned same-sex marriage.")
The minimum age for marriage in all US states that have legalized same-sex marriage is 18. (Younger persons can marry with parental consent, judicial consent, or both.) However, a 16-year-old can marry in Québec, Canada. Same-sex marriage is also legal in Canada.
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Massachusetts legalized gay marriage in the year 2004.
Gay marriage was legalized in Massachusetts on May 17, 2004.
No countries in the Balkans have legalized same-sex marriage.
Same-sex marriage has not been legalized in Laos.
No country in Central America has legalized same-sex marriage.
No former Soviet republics have legalized same-sex marriage.
No, Snopes has not confirmed the claim that Sweden has legalized child marriage.
Same-sex marriage was legalized in North Carolina on October 9, 2014.
Same-sex marriage was legalized in British Columbia on July 8, 2003.
Same-sex marriage was legalized in the Canadian province of Saskatchewan on November 5, 2004.
As of December 20, 2013, about 33% of US states have legalized same-sex marriage.
Same-sex marriage was legalized in the Canadian province of Nova Scotia on September 24, 2004.