I find the data here reflects the importance of what gets discussed on this forum.
Healthy ageing from birth to age 84 years in the Helsinki Birth Cohort Study, Finland: a longitudinal study
The true prevalence of healthy ageing on a population level is unknown. In this study we aimed to examine the upper limit for the prevalence of healthy ageing, by quantifying the probability of surviving and remaining free of chronic diseases that could impact functioning (ie, healthy survival) across adulthood. We also estimated the prevalence of clinically assessed healthy ageing, and the determinants of healthy survival and healthy ageing.
https://www.thelancet.com/journals/lanhl/article/PIIS2666-7568(23)00135-6/fulltext
