To gain a better understanding of the health perceptions, preferences, and activities of older adults (those aged 55 and older) around the world, the McKinsey Health Institute conducted an internet-based survey between late December 2022 and February 2023. This survey, planned to be conducted every 3-5 years, collected information on about 1,000 older adults per country. For the participants unable to fill out the survey because of medical conditions or lack of internet access, responses were collected from a spouse, child, or child-in-law.

Within each country, quotas and respondent weights were applied to ensure that the final sample was representative for the entire country with respect to age, gender, and proportions of urban and rural location and tertiary education. Weights were also used within each country to balance the sample, as much as possible, on respondents’ self-reported health status. This design was to ensure that results in one country on some measures don’t look better than those from another solely because a higher proportion of their respondents report health substantially above the average for their age cohort.