At 88 years, Isabel Sun-Chao steers her walker like a go-kart as her daughter and co-author Claire briskly keeps pace on high heels. We meet for dim sum at the Hong Kong Country Club, Deep Water Bay. What is her secret? Isabel confesses an aversion to workouts, avoids walking, loves fatty ham and enjoys home movies in laid-back comfort. Her most vigorous exercise is swimming mahjong tiles. She disses all keep-fit advice. The lady brims with vim and ready laughter.