I am French, interested in middle age history. There is simply no way I can read something which is 600 years old. I could maybe decipher one word out of 50. I

I am French, interested in middle age history. There is simply no way I can read something which is 600 years old. I could maybe decipher one word out of 50. I heard old French read aloud. I understood 10% (optimistically) and not even the overall meaning. I would say that starting from the 1700's the language slowly makes sense.