Not that being so mature is a bad thing, but there are times to be mature and there are times to be loose.
I have a reputation for being an improvisational actor, which is true, but I also know what I'm doing so that if the improvisational strand doesn't work I can go back to what I know's already there.
The prime goal is to alleviate suffering, and not to prolong life. And if your treatment does not alleviate suffering, but only prolongs life, that treatment should be stopped.