KUNMING, CHINA - DECEMBER 12: A senior citizen sits in his wheelchair in the yard of the Happy Times Nursing Home on December 12, 2007 in Kunming of Yunnan Province, China. Two-thirds of the elederly residents in the nursing home suffer from senile dementia. China's population is ageing; with currently over 140 million elderly citizens, the figure is expected to grow at an annual rate of about 3.2 percent in the next 50 years.