How Much Time Depth Can You Change in a Language?

Languages don't change at a constant rate. So that was the kind of mental benchmark I took for how much I could change things between the older system and the new system. You have probably fewer grammatical changes in a language like Tibetan certainly as many genetic changes Reading old Tibetan. But grammatically, it's been relatively conservative English in the last 500 years has been pretty playful English in the past thousand years. It does have to tie into the world building Absolutely.