In a similar vein...
In college I wrote a story called "The Immortality Plague"- the premise is that a scientist discovers the parts of the human genome responsible for aging, he designs a virus that will turn off the genes responsible- but the scientist knows that his creation will NEVER be given to everyone- he fears it will only be given to the rich and powerful- so, in order to ensure his 'gift' is given to all humanity, He makes the virus more virulent than the common cold and releases it.... most of the story was about the political and cultural changes that would result - for instance- governments would have to start legislating procreation... there would be riots....
It was a fun thought experiment...