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Objectives Healthy ageing (HA) is a key concept and highly desirable phenomenon in every ageing and already old societies. The aim of our study was to evaluate the influence of socio-economic conditions as well as life-style and other health-related factors on the WHO definition of HA. Design, Setting, Participants The study used cross-sectional data of the PolSenior Project — nationwide research evaluating different aspects of ageing in Poland — which included 4’653 respondents aged 65 years and over. Measurements Data were collected by trained interviewers in respondents’ homes. Three definitions of HA including or not the participants’ chronic conditions were analyzed. Results The prevalence of HA appeared as high as 17.6% if none or 1 chronic disease was present and 42.8% if no information about chronic diseases was taken into account. The association between known health predictors (age, marital status, education, income) and HA was observed. Moreover, HA appeared in relation with indicators of physical functioning and lifestyle. There was a strong concordance between HA and the fair self-rated health (OR = 1.87; 1.99, and 2.74 for the 1st, 2nd and 3rd definitions, respectively) and opposite relation with self-reported need for help (OR = 0.15; 0.15; and 0.13, respectively). Conclusions The HA definition based on no functional activity limitations, no cognitive impairment, no depressive symptoms, no more than one disease and being socially active seems to be a useful approach of HA.. Electronic Supplementary Material Supplementary material is available for this article at 10.1007/s12603-019-1243-5 and is accessible for authorized users.