An interactive layer that appears over the video.

An automated system that parses the filename logic.

Users can sync "Teens18yo-(1399).mp4" with another file (e.g., 1400 or 1398) to see what a different person in the same demographic was doing at the exact same moment, creating a "day in the life" comparison across different cultures or locations.

If this is a file within a large database, you could implement a system.