The current United States Congress fares

The current United States Congress fares poorly in terms of descriptive representation. It is more male, whiter, and older than the US population, which means that women, people of color, and young people are underrepresented in terms of demographics.

Can the US Congress collectively represent the American people in its current form when it does not descriptively represent the American people? Why or why not? In other words, are more women, people of color, and young people needed in the Congress, or can Congress do its job properly despite being older, whiter, and more male than the United States as a whole?