Comment by Terretta

> Should be "how far back in time can you read English?"

Made a version with modern glyphs to help separate language familiarity from writing familiarity:

https://gist.github.com/terretta/5be1e14b42cf62ec9c235c7cd88...

All credit to original, just agreed with your point this munged two things as presented and preferred to focus on the language.