Mieko Kawakami, who suffers from gait disorder due to partial paralysis, center, walks with an assistive walking device after being fitted with Cyberdyne Inc.'s lower-limb model Hybrid Assistive Limb (HAL) exoskeleton, aided by physiotherapists Masato Hasegawa, left, and Koji Ono, during a training program at the company's facility in Tsukuba, Ibaraki Prefecture, Japan, on Wednesday, Jan. 22, 2014. By 2035, one third of all Japanese will be 65 or older, up from 23 percent in 2010, according to the National Institute of Population and Social Security Research. Photographer: Kiyoshi Ota/Bloomberg via Getty Images
