The numbers of elderly are increasing rapidly in Thailand. Aging society impacted healthy lifestyles of living. This research aimed to develop the elderly caregiver competency to strengthen elderly health and life-long living. The concepts of health promotion model were investigated by methods of survey and focus group discussion process. The elderly caregiver competency was explored and developed in the Lower Northern part of Thailand. The samples were elderly caregiver and elderly in 2 steps using multistage random sampling and selective samples. The instruments of this research were questionnaire and record sheets. The statistical techniques were the frequency, percentage and mean. The research findings showed that the caregivers were adults and aging that have to take care of elderly who were moderately old and very old age with health status was at a moderate level. The conclusion was that the elderly caregivers were induced in the knowledge program to promote long-term elderly health in the community. The recommendation was the participatory activities with a community organization, various health communication in a community were needed to develop the model of the elderly caregiver competency development. For further research, it should apply the elderly caregiver competency development program to the other areas.