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Population increase will need to be managed.
It has a 100% mortality rate. Every human is predisposed to it. Its effects severely lower quality of life for sufferers (and those close to them) often for a long time. It is MASSIVELY expensive to society.
Longer human lifespans will lead to a more experienced work-force, scientific community and government agency.
Most people don't want to die.
I would say that making sure cancer and AIDS don't kill people anymore is more important than making sure grandma doesn't look 80 anymore
Unless it prevents heart disease and cancer we will continue to die in our seventies. It would be rational to prioritize developing better treatments for heart disease and cancer over anti aging medications.