Hongkonger Wong Yiu-ming was once uncertain about his role in society after retirement, but he has regained confidence after sharing his personal stories with students. “We thought we were teaching the young. But in truth, they helped us see ourselves differently,” said Wong, 71, who was deputy executive vice-chairman of a listed company in Hong Kong before he retired. Wong is one of about 60 elderly people who have shared their stories in classrooms, community centres and shopping centres...