This chapter focuses on the aspects playing a key role in older migrants' decisions to remain in the host country or return to the country of origin after retirement. International labour migration after World War II (WWII) was thought to be a transient period. The chapter looks at the factors influencing return and the back and forth choice in retired guest workers. It discusses the main factors influencing return migration. Return migration depends on the combination of a large number of factors that may constrain or favour it. Economic, social, cultural and health related aspects appear to play an important role in older migrants' decision to return to the country of origin or to stay in the host country after retirement. Older migrants may also have to face formal policy constraints regarding their decision to return. Age is an important predictor of return migration. The return intentions are influenced by the profession and by home ownership.