Older people are identified as a vulnerable group in disaster. There should be more focus on their capacities and needs. Yet, there are limited studies on flood knowledge, family support, and emergency response plans affecting older people's flood-management practices. The study aimed to examine the correlation between sociodemographic characteristics; knowledge of Disasters Resilience Family Program (KATANA), disasters, and floods; family support; and the emergency response plans in flood management. This study employed a quantitative approach and utilized a cross-sectional research design. It involved 105 participants selected using simple random sampling. The study found that (1) knowledge of KATANA, disasters, and floods remained relatively low; (2) older persons' practices before floods differed by age and gender, and practices after a flood varied by employment status; (3) family support for older people facing a flood was relatively poor; (4) emergency response plan vary based on education, gender, marital status, and family type; (5) older people with good knowledge of KATANA, disasters, and floods were 5.79 times more likely to be well-practiced in flood management than those who had not (OR = 5.79, p = 0.000). These findings suggest increasing older peoples' knowledge of KATANA, disasters, and floods through disaster-preparedness training and simulating government and civil society mitigation efforts to strengthen older individuals' disaster resilience. At the governmental level, detailed, comprehensive, and realistic actions in disaster management, especially targeted at older people, should be put in the New Disasters Rules for 2024 by the Indonesian National Disasters Management Agency.