as the oldest resident of castle rock , aunt evvie had held the boston post cane for the last two years , ever since arnold heebert , who had been one hundred and one and so far gone in senility that talking to him held all the intellectual challenge of talking to an empty catfood can , had doddered off the back patio of the castle acres nursing home and broken his neck exactly twenty-five minutes after whizzing in his pants for the last time .