Age Estimation of Strangers in Public settings: A Proof-Of-Concept Field Study

Laboratory research has shown that age can be estimated with mean absolute errors of approximately five years for faces and ten years for voices. However, it is less clear how precise such age estimates are in real-world settings, where observers often judge from a distance with less controlled and more variable access to facial and vocal cues. This proof-of-concept study assessed the feasibility of examining age estimation under ecologically valid conditions through naturalistic observation in public settings. Two observers estimated the ages of 565 strangers in public from a distance and subsequently approached each individual to record their self-reported age. The findings demonstrate that age estimation can be feasibly conducted in a systematic way through naturalistic observation, with preliminary evidence suggesting that the resulting mean absolute error was comparable to—and possibly lower than—errors reported in laboratory studies. While tentative, these results highlight the potential of studying age estimation in public contexts and support further observational research with larger and more diverse samples.