Of the following language groups, which is the oldest?

Question

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Proto-Indo-European is considered the oldest language group as it is the hypothetical ancestor of most modern European languages and some languages of Asia. It is not a spoken language, but rather a reconstructed language that linguists believe existed around 4,000 to 2,500 BCE. The other language groups listed (Germanic, Indic, Hellenic, and Celtic) all evolved from Proto-Indo-European and are therefore younger.

Of the Following Language Groups, Which Is the Oldest