The new feature of the Apple Watch Series 4, Fall Detection, is turned off by default.
The Apple Watch Series 4, which was released almost two weeks ago, and has many new features. One of those new features is Fall Detection; the Apple Watch automatically detects a fall and calls the emergency services after 15 seconds, if the user is not responding on his Apple Watch.
Now, it turns out that the Fall Detection feature is turned off by default, unless the user is 65 or older. The Apple Support document has been discovered by a Reddit user.