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No i don't think so there is such any mode!
But you may try some iPhone features and tips that make the device more accessible for seniors.
  1. Use Display Zoom. ...
  2. Increase the Text Size. ...
  3. Utilize Speak Selection. ...
  4. Turn Up Ringer Volume and Enable LED Alert Flashes. ...
  5. Enable Find My. ...
  6. Configure Favorite Contacts. ...
  7. Set Up Medical ID. ...
  8. Configure Emergency SOS.
 
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