From the linguistic data alone... it is not possible to draw definite conclusions about the homeland of the speakers of PIE, or even the age of the language family.

Clackson, James (2013) The origins of the Indic languages: the Indo-European model. In: Angela Marcantonio and Girish Nath Jha (eds.) Perspectives on the Origin of Indian Civilization. Dartmouth, MA: Center for India Studies, University of Massachusetts, Dartmouth. Pp. 260–288. Quoted in Asya Pereltsvaig, Martin W. Lewis - The Indo-European Controversy (2015)