This is the 1597th most frequent Japanese word.
幅広い
Wide-ranging; broad.
In this sentence, "幅広い" is used to describe the variety (wide range) spanning ages.
この講座は幅広い年齢の人々に対応しています。
This course accommodates people of a wide range of ages.
Here, "幅広い" emphasizes the expansiveness of her knowledge and skills.
彼女の専門分野は非常に幅広い。
Her area of expertise is remarkably broad.
In this context, "幅広い" relates to the diversity of interests one can have.