The present article organizes prominent theories about retirement decision making around three different types of thinking about retirement: imagining the possibility of retirement, assessing when it is time to let go of long-held jobs, and putting concrete plans for retirement into action at present. It also highlights important directions for future research on retirement decision making, including perceptions of declining person-environment fit, the role of personality traits, occupational norms regarding retirement, broader criteria for assessing older workers' job performance, couples' joint decision making about retirement, the impact of self-funded and self-guided pension plans on retirement decisions, bridge employment before total withdrawal from the work force, and retirement decisions that are neither entirely forced nor voluntary in nature. (Contains 1 figure.)