Argue that Radical Life Extension is Valid Research

If you only had 20 minutes, what would you do to convince an intelligent (college educated or professional) audience of the significance of life extension beyond 120 years? Assume they do not commit the tithonus error and are rational enough to understand that probably do want to live indefinitely so long as the quality of life meets their own standard. The problem then becomes convincing others that it is indeed possible to live very very long lives