in the flower of one's youth

Adverb

idiomatic literary

(literary, idiomatic) when one was young and happy

Japanese Meaning

若い時に、幸福に満ちていた時期 / 青春の絶頂期 / 若さと幸福がピークにあった時期

One often remembers the books discovered in the flower of one's youth as if they defined who they became.

人はしばしば、青春の花盛りに出会った本を、自分を形作ったかのように覚えている。

Sense（1）

(literary, idiomatic) when one was young and happy