How many fans does Green Day have?

The exact number of fans of Green Day is difficult to determine as it depends on various factors such as cultural differences, age groups, and personal preferences. However, the band has achieved significant popularity globally over the years. They have released multiple successful albums, performed sold-out concerts, and have a considerable social media following. The number of fans that actively and enthusiastically follow Green Day could be counted in the millions considering they've been around for quite some time.