A little cheer rose for 79-year-old Hwang Sun-hee after she managed to place an online order at a training session in South Korea, which has one of the world’s starkest digital divides for seniors. Age gaps in digital literacy are a global concern, yet the gulf has widened massively in the hyper-connected and fast-ageing country, prompting national campaigns to bridge it. “You can’t do anything without smartphone apps or a kiosk machine ... It’s too much for old folks,” Hwang said at a senior...