Because of the way languages change gradually, it is usually impossible to pinpoint when a given language began to be spoken. because of that written accounts are used to measure languages life.
so What is the oldest language in the world?
1. Sumerian language of ancient Sumer, which was spoken in modern Iraq since at least the 4th millennium BC.
2. Egyptian is the oldest known indigenous language of Egypt and a branch of the Afroasiatic language family. Written records of the Egyptian language have been dated from about 3400 BC. The national language of modern-day Egypt is Arabic
3. Akkadian also Accadian, Assyro-Babylonian is an extinct Semitic language (part of the greater Afroasiatic language family) that was spoken in ancient Mesopotamia (Irak). The earliest attested Semitic language, it used the cuneiform writing system derived ultimately from ancient Sumerian, an unrelated language isolate. The name of the language is derived from the city of Akkad, a major center of Mesopotamian civilization.
Most of the ancient languages have become extinct or have evolved and branched into several languages.
oldest languages that still in use are many but it is difficult to define which is the oldest one.
oldest languages still in use: