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よりずっと若い

much younger than

→ より
phrase Rare #34,528
much younger than より marks the point of comparison, and ずっと emphasizes the difference.
JA: 彼は兄よりずっと若いです。
EN: He is much younger than his older brother.

俺たち、トムなんかよりずっと若いよ。

We're way younger than Tom.

彼はトムよりずっと若い。

He is much younger than Tom.

私はトムよりずっと若いです。

I am much younger than Tom.