© 2022 The Authors. Child Development published by Wiley Periodicals LLC on behalf of Society for Research in Child Development. This is an open access article under the terms of the Creative Commons Attribution License, https://creativecommons.org/licenses/by/4.0/In a cross‐sectional study, 5‐, 7‐, and 9‐year‐old‐children and adults (N = 144, 86 females, predominantly White U.K. sample of lower‐middle to middle‐class background) were interviewed about their experiences of involuntary autobiographical memories (IAMs) and semantic mind‐pops that come to mind unintentionally. Although some age differences emerged, the majority of participants in all age groups claimed familiarity with involuntary memories and provided examples from their own ...