As published by a new Apple Support article, it says:
If you’ve entered your age when you set up your Apple Watch or in the Health app and you’re age 65 and over, this feature automatically turns on. Apple Watch cannot detect all falls. The more physically active you are, the more likely you are to trigger fall detection due to high impact activity that can appear to be a fall.
This feature is good for customers of older age, who’s bones tend to break more easily after a fall. You can read the Apple Support Article here and learn more about the feature and see it in action.
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