Source: Nielsen
Notes: Radio is particularly popular among female Hispanic Millennials (18-34), of whom more than 94% listen to radio on a weekly basis. Further data from Nielsen [download page] indicates that radio reaches roughly 90% or more of each age group for both Hispanics and African-Americans. The top 3 formats for Millennial Hispanics are: Mexican Regional; Pop Contemporary Hit Radio; and Rhythmic Contemporary Hit Radio.
Related: When America Listens to the Radio