What year did montenegro become a country?
Montenegro regained it's independence in 2006, but Montenegro was an independent country much before the separation with Serbia.
Either Kosovo or Montenegro is the youngest country in Europe; Kosovo declared independence but is not yet fully recognized as a sovereign nation, Montenegro, however, is. Kosovo declared independence from Serbia on 17 February, 2008 (4 years old). Montenegro declared independence from Serbia and Montenegro on 3 June, 2006 (6 years old).