“…It is the study about Septuagenarians, Octogenarians, Nonagenarians Investigation with Centenarians (SONIC study). Aims of the SONIC study are to investigate age differences and similarities in factors influencing healthy aging and psychological well-being including psychological (cognition, change in emotion and compensation; personality, psychological development), social (socio-economic status, social relationship), medical, dental and nutritional aspects [22]. Study participants include more than three thousand, septuagenarians aged 69-71 years, octogenarians aged 79-81 years, nonagenarians aged 89-91 years, and centenarians aged 100 and over collected from four urban and rural towns in Japan.…”