Because "Young[21]" is a generic naming convention, it is also frequently seen in:

The name often led users to believe they were downloading a music video, a movie clip, or sometimes—given the "Young" and age indicator "[21]"—sensitive or adult content.

Instead of the expected content, the video usually contained a "Screamer" —a brief, low-quality clip that suddenly transitions to a terrifying image accompanied by a loud, distorted scream intended to startle the viewer. Cultural Impact

It may appear in digital archives for sports highlights (e.g., "Player Name, age 21"). January | 2014 - Hockey Graphs