Cognitive and social factors can deteriorate eyewitness identification performance in children and older adults. An identification procedure that mitigates the effect of such factors could be beneficial for child and older adult witnesses. In a field experiment, we mapped identification performance in a large community sample (N = 1,239) across the lifespan (ages 6-79 years) for two different identification procedures: classic lineups and reaction time-based Concealed Information Test (RT-CIT). Visitors of a science museum or science fair witnessed a recorded mock theft and then took either a classic lineup, or the RT-CIT. As expected, young adults (18-45 years) consistently outperformed younger age groups in lineup performance. The RT-CIT showed a moderate capacity to diagnose face recognition and absence of recognition in the target-absent condition. Importantly, age did not affect identification with the RT-CIT. Thus, lineup performance was more vulnerable to age effects than the RT-CIT. However, this did come with a considerably lower utility (i.e., exclusion rate of more than 40%). These findings suggest that the RT-CIT might be considered an alternative identification procedure for children, offering protection for innocent suspects.