FUJISAWA, Japan - When 82-year-old Masako Wakamiya first began working she still used an abacus for maths - today she is one of the world's oldest iPhone app developers, a trailblazer in making smartphones accessible for the elderly. Frustrated by the lack of interest from the tech industry in engaging older people, she taught herself to code and set about doing it herself. The over 60s, she insists, need to actively search out new skills to stay nimble. "As you age, you lose many things: your husband, your job, your hair, your eyesight.