[sgxin]

Your life, your responsibility. 
When alive, make sure you stay connected.
To neighbours, social network, friends and best your own relatives. 
Make sure someone wishes you a good morning everyday. 
If no reply, be sure to check.

Doesn't need these once the water meter goes digital in future.
The water usage profile can easily tell if the sole occupant is alive or not.

But staying alone in old age isn't really ideal as I believe one can get dementia much more easily from the lack of social interactions.
This Shandong retirement village (group) offers the best and cheapest retirement model imo as it offers large retirement apartments (20-40years lease), cheap cooked canteen food, lots of activities n classes fro the residents and even the chance to do their own farming.