How to set up my Apple Watch to allow me to call for help at 54
How do I set up my Apple Watch to allow me to call for help when I fall?
Apple Watch Series 7
If you are 55 and over, the fall detection feature turns on automatically. But you can turn it on or off manually at any age. See the 'Turn Fall Detection on or off' section in:
Use Fall Detection with Apple Watch - Apple Support
Also see:
Use Emergency SOS on your Apple Watch - Apple Support