As an adult, I'm working on learning French, coming from a background growing up speaking a few languages natively. According to French friends of mine I practice with, I have a "good" accent, but I've never been a big fan of "good". So to me this begs a question:
Given a few more years of work, could I as an adult reach the point where as far as, say, 95% of native speakers can tell from my accent, I'm Parisian by birth?