幼い頃

when I was young

→ 幼い
phrase Rare #38,292
when I was young Means “when someone was young”; the person is usually clear from context. 幼い頃から means “since childhood.”
JA: 幼い頃、よくこの公園で遊びました。
EN: When I was young, I often played in this park.

幼い頃、アメリカに移住しました。

I moved to the United States when I was young.

あの娘は幼い頃かわいかったと思う。

I think that girl was cute when she was little.

幼い頃はよく病気をしたものです。

I used to get sick a lot when I was little.

幼い頃のナウシカを思い出す

It reminds me of Nausicaä when she was young.

— 風の谷のナウシカ (1984)