Describing the Distribution of Quantitative Variables Practice Test

When describing the distribution of a quantitative variable, why is it essential to address unusual features like outliers or gaps?

A local gym records the ages of its members. The data reveal a large number of members between 20 and 35 years old and another large number of members between 55 and 70 years old, with very few members in between these two ranges. Which unusual feature is present in this distribution?