The Actor feat (PHB, p. 165) says:
You can mimic another person's speech or another person's sounds
Creatures. You must have heard the person speak. or heard that
Creature makes the sound for at least 1 minute.
If a player learns this feat on the eighth level, can he imitate the language he heard on the first level (when he didn't have the feat)?
What about a speech 200 years ago when you were a little elf child?
RAW, I think it's allowed. And I don't think it breaks the game to allow it. But I am curious if I am missing any aspects. I would assume that the 200 year old speech must have been unforgettable at least in some way! 🙂