Waiting To Fill Out A Living Will Directive

My friend’s living will directive was filled out a few years ago. When I asked him why he filled one out, he said that he did not want to be prolonged in life when he is faced with death. I suppose this is a good reason to fill one out. My parents had filled theirs out fairly recently. I may do the same, but I’ll wait until medical technology has improved, in case resuscitation becomes possible.