I find davv's interpretation of the question puzzling, since it seems to assume you "duplicate" yourself in some way - whereas the question says it will "end my existence". I read it as the current "me" would vanish, in favor of this "other me" - which is an opportunity I would certainly take, if only I had any way of determining just which is an appropriate/crucial juncture, and what is really the correct course of action in that case.