Riddle of vanishing centenarians exposes malaise in Japanese lifeTOKYO LETTER: Macabre details of old people’s remains are symptomatic of family ties unravelling, writes DAVID McNEILL TOKYO LETTER:Macabre details of old people's remains are symptomatic of family ties unravelling, writes DAVID McNEILL When social workers turned up recently at the Tokyo home of 111-year-old Sogen Kato – officially l