I mentioned somewhere or other after I first saw TFA, that I loved the way Snoke looked like an Evil version of the Lincoln Memorial…
…but I just compared those nice shots from the OP with some Lincoln face-casts and there is a possible influence there IMO…
Darth Ezra!
This…makes sense. Age wise Ezra would old and Dark Side degradation would exacerbate his aging. Also in the new Rebels trailer it is being made apparent that Ezra will be tempted by Darth Maul.