Ask anyone over 40 for their sharpest memories — most cluster around age 20

Plot people's most vivid life memories against the age they happened, and a bump appears between roughly age 10 and 30 — far more than recency alone explains. This 'reminiscence bump' shows up again and again, across cultures and methods. The years you became who you are get remembered out of all proportion.

— David C. Rubin, Scott E. Wetzler, Robert D. Nebes, Autobiographical Memory Across the Adult Lifespan — in Autobiographical Memory (ed. D.C. Rubin), Cambridge University Press, 1986
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