Aging. Right. Think of one of those old Xerox machines. You know like an earlier version with lots of mechanical parts, and toner and special paper. A kind of old world machine. Imagine this old, and kind of clunky copier. Not too good. This is all a metaphor… right?
And think of a copy of a copy, of a copy of a copy, etc. A copy of copy over and over and over. With each copy the outlines of the image grow fainter, things sort of smudge around the edges. There are little variations. Specks of dust. The toner sort bleeds out on the image. There is noise. No longer clean edges. Everything gets a little fainter, and smudgier, and noisier, and finally the image starts to slowly fade and disappear.
Yes, it's like that.