I haven't read this, but Will Harlow mentioned it in his latest video. Ageing as a mindset: a study protocol to rejuvenate older adults with a counterclockwise psychological intervention:
Although ageing is generally perceived as a biologically determined process, the literature increasingly points to the importance of psychological factors in the ageing process, specifically age-related stereotypes or cognitive mindsets. Such stereotypes reflect self-perceptions and others' perceptions about the ageing process and can have a strong influence on health and life satisfaction, specifically through self-fulfilling prophecy mechanisms.