The U. S. counties that border Mexico have an unusually high percentage of people in which age group?

18-39

Explanation:

nowadays, Mexican immigrants are more likely to be college graduates being fluent in English unlike other decades. on average, Mexican immigrants are younger than other immigrants, but they are older than u.s. born. In this way, 4% are people under 18 years old, 10% are 65 years old and over, and 86% are people from 18 to 64 years old.

es is the right