I think the idea of revolution as a result of age-disparity is a tad overstated. At the point most people would become sufficiently aware of any age-gap, and angry-enough to want to riot about it, you'd probably be suffering age-related effects and want a nap.

Also, drugs eventually fall out of patent and become available at far lower prices to everyone. The poor have far larger problems than whether they get to live an extra 10 years or so once they get to 70.