When Does a Miss Become a Ms?

I realised that since I moved back home, I am no longer referred to as "Miss." I am now a Ms. For a while, I held out and continued to sign my letters with Miss. However, I have (unconsciously) started to get on that Ms. train. Even when people don't know how old I am, they still address me as Mizz. I know that some women do not enjoy being referred to as Ms. I am not sure what other people's reasons are, but for me, Mizz has always carried with it connotations of grim and determined spinsterhood. Maybe it's the way people say it, but many of the Mizzes I know are anything but grim.

Hmmm, questions to mull over....