Which is the most pressing issue with winter weather for seniors. Injuries sustained from a fall are one of the leading reasons people are moved from an independent living situation. Losing your mobility from a fall is also a quick path towards death.

That's an example of poor walkability due to government choices.

How so? Are there many places that get -30 C and don’t have snow/ice?

No, but there are various cold countries where the government

- eagerly clears the snow

- provides capillary public transportation

- provides city-wide heating

- encourages the development of large buildings (even connected with each other) instead of isolated homes

It's survivable, sure. As someone who biked to work in Wisconsin winter, skis, and makes sure to get outside every day for exercise, -12 to -17 is as low as I'll go.