This experiment examined children's and undergraduates' verbal and nonverbal deceptive behavior, and the extent to which their truths and lies could be correctly classified by paying attention to these responses. Participants (N = 196) aged 5-6, 10-11, and 14-15, as well as university undergraduates, participated in an erasing the blackboard event, and told the truth or lied about the event afterwards. Nonverbal and verbal responses were coded, the latter with Criteria-Based Content Analysis and Reality Monitoring. Although children and undergraduates demonstrated different behaviors (for example, the children obtained lower CBCA scores and made more movements), actual cues to deceit were remarkably similar across different age groups (for example, both 5-6-year-olds and undergraduates obtained lower CBCA scores and made fewer movements while lying). A combination of verbal and nonverbal lie detection methods resulted in more correct classifications of liars and truth tellers than the verbal and nonverbal lie detection methods individually, with the combined method obtaining hit rates as high as 88%.