Under the development trend of age-friendly society, the living needs of the elderly have gradually become a hot spot of concern. Among them, indoor space, as the main activity place for the elderly, has a crucial impact on the quality of life of the elderly. In this paper, the objective function is determined according to the task of optimal selection of indoor layout candidates, and the problem of solving model parameters is transformed into a structured regression problem to solve the parameter problem of the model, and the modeling method of indoor space layout estimation under the optimal selection of layout candidates is proposed. Meanwhile, for the conflicting needs between family members and the elderly in the ageing indoor space retrofit and the associated paths of different functional spaces, the basic idea of dynamic programming is used to solve the optimal paths. By combining the dynamic planning method and the layout estimation modeling method, a retrofit design method for aging-adapted indoor spaces is formed. Using this method to design a retrofit program for the aging space, the proportion of “very satisfactory” rating reached 41.98% in the satisfaction evaluation of the actual layout features, which can effectively adapt to the needs of the elderly.
