So, though we can’t be as sure it’ll benefit us as much as, e.g., controlling blood pressure or quitting smoking, “it is plausible that [ikigai] contributes [to longevity] indirectly by encouraging engagement in meaningful activities, fostering social connections, and reducing stress, all factors known to influence physical and cognitive health as people age”.
Article source: https://www.huffingtonpost.co.uk/entry/ikigai-healthy-ageing_uk_69c2a137e4b081b0ba59d6ce