は若い人達

… young people

→ は
phrase Rare #30,409
… young people は marks the preceding word or phrase as the topic; 若い人達 means “young people.”
JA: この映画は若い人達に人気です。
EN: This movie is popular with young people.

あの歌舞伎役者は若い人達に非常に人気がある。

That kabuki actor is extremely popular with young people.

私は若い人達に役に立つと思ったことを書き留めた。

I wrote down things I thought would be useful to young people.

あの歌は若い人達に非常に人気がある。

That song is very popular among young people.

彼は若い人達に囲まれているのが好きだ。

He likes being surrounded by young people.