I know linguists like to say "no languages are older or younger than other languages" because they all evolved from ancient roots. With exceptions such as Nicaraguan Sign Language.
So let me explain that I'm specifically talking about cases where one settled language splits and one branch gains a degree of non-mutual-comprehensibility with the trunk. I'm interested only in the cases where few linguists would disagree that the result is two languages.
The recent cases I can think of are:
- Yiddish from High German
- Afrikaans from Dutch
- Maltese from Arabic
Without getting too deeply into controversial cases, would one of these or some other I've overlooked be the most recent?