An increasing body of literature considers population aging and labor markets, focusing on the dynamics of older workers’ labor market participation. Singapore introduced the Workfare Income Supplement (WIS) scheme in 2007, targeting low-income, older workers. Previous studies show that labor force participation drops significantly after the age of 45. We examine whether a wage subsidy program can increase the labor supply of these older workers. Using Hong Kong as a control group in a difference-in-difference-in-difference approach, we find that this program increased labor force participation for women aged 60–64 by 3.1–5.5% points, but had no statistically significant impact on the labor supply of men.