This thesis will present and explain a new model for preparing for aging in the future. The model has four dimensions; each dimension has both subjective and objective indicators. This thesis will focus on physical, mental, social, and personal financial dimensions. The literature about the approach to prepare for survival at old age raised a variety at research question such as: why should we prepare for aging? When should we prepare for aging? Who should start to prepare? And how should we prepare? It is important to make preparation for old age when individual is young. Preparing for old age is necessary for everyone, because everyone goes through the process of aging. Healthy aging has mainly been described in four dimensions. Before analyzing in four dimensions (both processes and methods). It is necessary to know why people should prepare. This question is significant due to the increasing share of the elderly in the Thai population, with this trend inevitably continuing. The vast majority of the elderly population is unhealthy and has limited physical and mental function. This is a result of a lack of preparation by each individual and limited government support. Recently, however, the government has been investing more money into government hospitals, helping those who are not prepared for aging. If the elderly population continues to rise, there will be less funds available for the government to spend on caring for the elderly due to a decline in the Thai working population. Therefore, it is vital for individuals to prepare for aging by themselves. When should we start preparing for aging? People with high economic and social status prepare for a shorter time compared to others with lower status. Consequently, if someone retires at an early age, they will have had less time to prepare. Who should be preparing? This question holds great importance as everyone faces the process of aging who prepares early; they will be more comfortable in the future. What should we do to prepare? To answer this question it is necessary to observe four dimensions: physical health, mental health, social health, and personal financial health. How should we prepare?