havent lived. “I didnt live long enough” means your life ended! past tense. hasn’t means its still going “have not (yet)”. I don’t know the formal rules behind it all though.

its interesting because it sounds more correct to use have not yet because your life is still going on but its going on in the forward direction, not backwards in time to overlap an earlier HN state. So you could say its not right, but the sentence sounds/feels more right to preserve that your life is still going on.

We like that you are still here with us.