Between the ages of 15 and 25, many people experience significant life events that create lasting memories. These 'firsts'—such as first love, first job, and other milestones—are often remembered more vividly than experiences from other periods.
Studies indicate that adults over forty tend to recall memories from this age range disproportionately. This clustering of memories suggests that the brain is particularly attuned to capturing these formative experiences.
The phenomenon is not due to an increase in cognitive function during this time, but rather the richness of experiences that are unique and often not repeated later in life.