I'll give you a hint - English ain't one. Here's a cool little article about the 10 oldest languages still spoken in the world today. Proud to see Irish Gaelic on the list. It's also interesting to note that if you want to hear the proto-Indo-European tongue as close to the real thing as possible, just google someone speaking Lithuanian. The most interesting bit of all is that Basque is a linguistic mystery - it's unique in that it's not related to any other language.