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If it is simply a state you want to save then you do not have to add anything in Blender. It is just Python and SDL. The SDL file for an on/off state would look something like this.

 STATEDESC MyAge
 {
    VERSION 1 
    VAR BOOL    MyState[1]   DEFAULT=0
 }

DEFAULT=0 will set the variable to 0 when the age is visited for the first time.  Note: "MyAge" should be changed to match the name of your age.  Also, the SDL file should be named MyAge.sdl and placed in the SDL folder; use PlasmaShop to create and edit SDL files.

Reading an SDL with Python:

            ageSDL = PtGetAgeSDL()
            getSDL = ageSDL['MyState'][0]

Changing an SDL with Python:

            ageSDL = PtGetAgeSDL()
            ageSDL['MyState'] = (1,)


To allow your Python object (or plModifier) to be notified upon any changes in the SDL, you'll need to first initialize the SDL variable within the OnServerInitComplete() method:

            sdl = PtGetAgeSDL()
            sdl.setFlags('MyState', 1, 1)
            sdl.sendToClients('MyState')
            sdl.setNotify(self.key, 'MyState', 0.0)

Then the plModifier's OnSDLNotify() method will be triggered when the variable changes.  Here's some sample code to detect a change:

    def OnSDLNotify(self, VARname, SDLname, playerID, tag):
        if (SDLname != "MyAge"):
            print 'SDLname =',SDLname,', not MyAge'
            pass
        elif (VARname == "MyState"):
            ageSDL = PtGetAgeSDL()
            getSDL = ageSDL[VARname][0]