Autobiographical memories are not distributed equally across the life span. The reminiscence bump refers to increased recall throughout their lifetime by adults of autobiographical memories dating to the period of approximately 15 to 25 years of age.
This reminiscence bump has been suggested to support the emergence of a stable and enduring self.
See Self Centred Memories: The Reminiscent bump and the self, Rathbone C.J, Moulin, C. J. A. and Conway, M. A. (2008)