Japan is one the most rapidly aging societies in the world. It is predicted that a third of the population will be over 65 by 2025. OiBokkeShi is a theater project that uniquely approaches the problems of the aging society through theater. Based on the principle of introducing the wisdom of theater into care homes and the profundity of care homes into the theater, it has staged performances at care homes and theater spaces, organized rehabilitation for the elderly through games and play, and run theater workshops for the general public. By working with people suffering from dementia and exploring the universal theme of aging, OiBokkeShi gets closer to the heart of what it means to “perform”: building a relationship with others who we do not know or understand. For Theater Commons Tokyo, OiBokkeShi presents two workshops: “Aging and Theater” (open to the general public) and “Rehearsals for Aging” (for participants aged 65 and over). In Tokyo, where loneliness among the elderly is a growing problem, a new relationship between caregiving and theater will develop.