Much as I love Bernie, this is why he can't be prez. He's 78 years old as of now. And we've all seen the job of POTUS age people ten times their years during their time in office. Just look at 2008 vs 2016 pics of Obama, or even Bush in 2000 vs 2008. It's like something out of a horror movie, or an undead critter in some RPG. Age 40 years in one tenth the time.
Good on Bernie for putting social democracy, or at least old fashioned new deal liberalism back on the menu, but the torch obviously needs to pass to someone younger.