I save most. At my age, I don't need too much because I have everything that I need.
I save it and only use it when I need too. I have plenty saved up but I don't blow money on useless things.
No, they go off all the time even with the slightest touch. One in our complex used to go off hourly.
Maybe at one point but I think people are so used to hearing them go off now that no one really notices, maybe not even care anymore.