Practical Alexa use cases for elderly:
1. Schedule/ask cooker to start, then stop after fixed time.
2. Blind person can control microwave with voice.
3. Blind person navigation via prompts from multiple Echo devices.
4. Blind person notification when doors opened or motion detected.
5. Blind person item locator, via Tile + Alexa.
6. On-demand instructions for caregivers.
7. On-demand physiotherapy exercise instructions.
8. On-demand streaming radio and podcasts.
9. TV voice control via Logitech Harmony or Android Fire TV.
10. Call PSTN phones via VOIP (10 number limit).
11. Zigbee devices with USA-based cloud security (Echo4 is a hub)
12. Arm/disarm Blink cameras.
13. AC/heat control via temperature sensor in Echo devices.
14. Announce notifications from Google Calendar.
If Amazon would open up their devices and/or APIs, much much more is possible. There are some workarounds via HomeAssistant.