So I'm going to say this once then move on to my little experiments.
If you follow economics most of the developed nations are at a turning point. Population growth and replacement is falling. Most of the industrial world suffers from a lower then 1.6 birth rate. What does this mean? Well as the population ages the social systems are becoming overwhelmed. This means that governments will have a choice, mass immigration or find some way to keep the aging population working, namely by finding a way to restore youthful vigor to older citizens. In the west a lot of countries have opted for mass immigration as a solution because it's politically empowering for certain groups of politicians. At some point though some of the governments will choose to target the other choice, restoring vigor to older citizens. Once a larger enough group becomes aware that this is possible they will embrace it whole heartedly because it provides the superior solution. Aging science will be the savior of
many governments providing a way to raise the retirement age, reduce the cost of health care and education, while people will argue that this will make other expenses higher I'm pretty sure the wisdom of the centennials will prevail.
As far as signing petitions go ahead. Watch the birth rates and the level of education in the world, find a country with a low birth rate and high education level and I'll show you a place with very advanced aging science. This is going to happen just as a matter of evolution. My bet right now is Japan, or Korea.