All languages constantly evolve and so linguists generally dislike the concept of an "ancient language", but having said that, there are significant indications that click languages like the ǃKwi family (and other San languages) are of enormous antiquity.
nytimes.com
nytimes.com
Although the !Ora [Kora] language was considered extinct, in 2007 two very elderly people were found who still understood some of the language. A book 'Kora: A Lost Khoesan Language of the Early Cape and the Gariep' resulted - the author's draft is here:
researchgate.net
researchgate.net
You can read more about Menán du Plessis' 'Kora: A Lost Khoesan Language of the Early Cape and the Gariep' published by Unisa Press in 2018 here:
unisa.ac.za
unisa.ac.za
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