Japan has a rapidly ageing population with senior citizens expected to make up 40 percent of the population by around 2060. A company in Iruma, north of Tokyo, has developed tiny nail stickers that can be attached to seniors’ fingers and toes. Each of the nail stickers carries a unique identity number to help concerned families find missing loved ones suffering from dementia. If an elderly person becomes disorientated, police can identify the local city hall, its telephone number and the wearer’s ID all embedded in the sticker’s code. The chips remain attached for an average of two weeks — even if they get wet.