Leong Yuet Meng cannot walk more than 10 meters without assistance. Yet, the frail 90-year-old still runs a wonton noodle stall in downtown Singapore, selling at least 200 bowls on any given day.

Leong rises around 4 a.m. to do some accounting and prayers before her son drives her to the local market to buy ingredients for the day ahead.

From 8 a.m. to 5 p.m., she is hunched over a pot of simmering noodles, slicing char siu — barbecued pork belly — or serving bowls of bargain-price hot food.