The United Nation's Sustainable Development Goal 8 (SDG8) emphasizes decent work and the need to generate employment for vulnerable groups such as women, youth, and low-income rural and urban residents. Though extended retirement age policies to sustain workforce productivity are promulgated across OECD states, within SDG8 there is no evident focus on older citizens' need for decent work. We believe this goal lacks detail in addressing the specific needs of older and post-retirement workers and their equal vulnerability to inadequate decent work conditions, economic strain, and diminished well-being. We expand on this issue with particular focus on this older cohort's predictors and attainment of decent work and proffer the psychology of working theory as a foundation to redress the inadequacy of SDG8 and formulate recommendations for policy and research to recognize the needs of older and post-retirement workers. This approach is aligned with the Psychology of Sustainability and Sustainable Development framework in a lifelong perspective.