Do Crt Monitors and Televisions loose image quality over time?

[Electronic M]

VGA is analog video with digital control signals to control sleepmode etc.
I know because years back I tried to get VGA to display on an old color set. I could get quadrupple images in monochrome, but the fact that I did not want to try to duplicate the digital signal that the monitor sends to the cpu syopped me from trying to improve the analog side.

Tom C.