According to the 2017 Labor Force Survey conducted by the Ministry of Internal Affairs and Communications, the number of employed senior citizens (65 and older) in Japan reached a record 8.07 million. Elderly workers increased by 370,000 compared to 2016, bringing the ratio of senior citizens in the overall workforce of 65.3 million to 12.3%, also a record high.
Source: https://www.nippon.com/