Almost 4500 citizen scientists from over 120 countries of origin have uploaded ~4700 facial photographs. The database currently contains around 220,000 perceived age guesses. Using perceived age enables us to collect large amounts of data on biological age through a citizen science project, where people upload facial pictures and guess the ages of other people at The data on perceived age we present here span birth cohorts from the years 1877 to 2012. Here we present a unique database rich with possibilities to study the human ageing process. Perceived age is such a biomarker that correlates with biological age. Biomarkers of ageing are used to quantify changes in the aging process and to determine biological age. Underlying this higher life expectancy is a change in how we age. In many developed countries, human life expectancy has doubled over the last 180 years.
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