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A classical language is a language with a literary tradition that can be judged as "classical".
According to literature, not the language itself. No language is inherently more "classical" or "ancient" than another in terms of phonology or grammar.
The following languages fit Greek
Written Tamil is relatively unaltered since 2500 years ago. For example, the Tirukkural (2000 years old) is comprehensible to present-day speakers. Currently, the language has 70 million speakers.
See also: Recognition of Tamil as a classical language