Soon, medicine will reach a whole new level that will increase life expectancy to 150 years. 
I think this will actually happen in our lifespan. IF you see the pace of all developments. I'm pretty sure a Cancer treatment is at most some years away!
I actually know people who truly believe that the aging problem will be fixed in our lifetime and that there is a big chance that we can live a lot longer without dying from natural disease. I dont know what to think of that