Languages don't maintain internal mutual comprehensibility over those sorts of time frames. This is what English looked like 1000 years ago: https://www.poetr

Languages don't maintain internal mutual comprehensibility over those sorts of time frames. This is what English looked like 1000 years ago: https://www.poetryfoundation.org/poems/43521/beowulf-old-english-version https://www.poetryfoundation.org/poems/43521/beowulf-old-eng... The only ones that maintain any significant population that can use them are those that are liturgical languages (e.g. Latin, Hebrew, Classical Greek, Classical Arabic, Sanscrit, ...)