Shot Schedule

Alrighty, here’s another writing prompt.  This one could be a short story, or run on forever.

CraftyAggie Prompt #2

What would happen if society were extremely schedule oriented? So schedule oriented that the citizen would be shot, executed, poison  drop dead (something along those lines, but you get the point) if they went off track by more the {set period of time}.

How did society come to be this way? Has it always been like this? How do the citizens die? How do they know when they’re supposed to die? Is there an age limit for the deaths?