Terminator: Dark Fate and Terminator Genisys both featured older versions of Arnold Schwarzenegger's T-800, but how was the robot's aging possible?

It's no secret that it's been a few years - ahem, decades - since the original "Terminator" film hit the big screen, making Arnold Schwarzenegger's Guardian character an action film icon in 1984.

If "Terminator Genisys" truly was the genesis of a new science-fiction action franchise, it would probably get a pass for being a serviceable way to cram a lot of computer-generated destruction ...