Visual estimation of biological age of elderly subjects: Good interrater agreement

Background: Visual estimation of age can be used as a measure of biological age (BA) and has become useful in predicting life expectancy. Objective: T he aim of this study was to quantify the interrater agreement of experience d geriatricians in visual estimation of BA. Methods: In a prospective contr olled study, 4 experienced geriatricians estimated the BA of 43 elderly sub jects (mean age 82.5 +/- 6.0 years) during a short standardized interview, using a checklist of age-associated changes in appearance, communication an d mobility. Interrater agreement was calculated by analysis of variance and expressed as the intra-class coefficient of correlation (ICCC). Results: T he ICCC of the BA estimation was 0.76 (p < 0.001). Within-subject standard deviation of the estimate was 3.4 years, On average, BA was 4.8 (+/- 4.4) y ears lower than chronological age (p < 0.001), Conclusion: Visual estimatio n of BA based on a simple checklist has a good interrater agreement and the refore should be part of geriatric assessment.