If you're in the USA - Snug Safety is a great option for seniors living alone who are not ready or don't want a Life Alert necklace.

Website: https://snugsafe.com

Snug is available for Android (Google Play) and iOS (iPhone only).

Disclaimer: I currently work on Snug Safety. Please send any questions to support@snugsafety.com and we'll definitely be able to answer them.