  We review current progress in the study of the stellar populations of
early-type galaxies, both locally and at intermediate redshifts. In particular,
we focus on the ages of these galaxies and their evolution in hopes of
determining the star formation epochs of their stars. Due to serious remaining
systematic uncertainties, we are unable to constrain these epochs precisely. We
discuss our results on the evolution of stellar populations in the context of
other observables, in particular the evolution of the Fundamental Plane of
early-type galaxies.
