よりずっと若い

much younger than

→ より
phrase Rare #36,675
much younger than Used to compare ages. より marks the comparison with “than,” ずっと adds emphasis meaning “much” or “far,” and 若い means “young.”
JA: 私の姉は私よりずっと若いです。
EN: My older sister is much younger than me.

彼はトムよりずっと若い

He is much younger than Tom.

俺たちトムなんかよりずっと若い

We're way younger than Tom.

私はトムよりずっと若いです

I am much younger than Tom.