Languages are subject to evolution
How does a language evolve? When does a language get conceptualized as a living one or become defined as a dead one? Isn't it an interesting thought?
Languages become 'living' when it evolves. Those languages which are not evolving become a 'dead' language. That is why several languages have vanished or are about to vanish. To a certain extent, our Sanskrit is facing this problem.
In our country, there are several languages spoken by a limited number of people mostly belonging to a particular community. But most of these languages had no alphabets of its own. Hence it borrowed several words from other commonly used languages. This slowly consumed the old local usages and got replaced with the new one. But living languages borrow words from other languages and get expanded. A unique example is English language. Perhaps compared to any other language that is the language which borrows words wherever it is found useful. For example from Malayalam, it has borrowed several words such as mango, Jack, etc. Oxford dictionary announces how many new words are added when a new edition is published, and from which of the languages they are taken. This English is becoming a typical 'living language'.