It could be that considerable “anti-senescence” / immortality research is urgently needed! Here’s a demographics report indicating that the vast majority of the world is falling below replacement birthrates, much faster than expected (even Iran! 😉 ):
http://www.fpri.org/ww/0505.200407.eberstadt.demography.html
Highlights:
Depopulation by birth shortage in all the world — except Africa and the US; huge male child imbalances throughout Asia; falling lifespan in Russia.
So we elderly are going to have to be hale enough to support ourselves …