(If you are actually married or otherwise committed, you don't have to play.)
Quick, you've been thrown back in time to whatever era/region makes sense for the question, and your only way to avoid being shunned for being unmarried at your age (a real spinster), is to lie and claim you are a widow/er.
What name do you claim your late spouse had? What do you base this imaginary person's personality on? Remember, you'll have to keep your story straight!
Keep it in the tags so the post doesn't bloat unless you've got something really interesting.