The Bill & Melinda Gates Foundation [wiki] set its own lifespan (or death, if you will). The world's largest (transparently operated) charitable organization decided that there's no life in perpetuity in its future:
In a statement posted on the charity's Web site, dated November 29, the foundation said: "We will be spending all of our resources within 50 years after the last of Bill's or Melinda's death." The news was reported earlier by the Wall Street Journal.
"The decision to focus all of our resources in this century underscores our optimism for making huge progress and for making sure that we do as much as possible, as soon as possible, on the comparatively narrow set of issues we've chosen to focus on," the foundation said in the statement.