a long-lived passion is as unthinkable as a flower that never withers -- it is against the law of nature.
one has to decide what he/she is really after -- some kind of passion to die for? or a peaceful marriage that fulfills it's life cycle without too much excitement or surprise.
you need enough guts to pursue the former, for you most likely will end up as a lonely soul who will not even have a grave-digger. and you need enough wisdom to test the later, for you can lose your bet of life at any time, for any reason, and to anybody.