men of all ages are referred to as a "Mister".....rarely see or hear of "master" which is supposedly used for young boys....
I haven't heard anyone use "master" in years, probably it's un-PC? But I read in an etiquette column recently that you use "master" up to about age 7 or something, and "mister" after age 12, and from ages 7 to 12, no title at all for a boy. I may be misstating the ages, but it was a weird complicated rule that I'd never heard of....
Yes, except a woman cannot be Mrs. "her first name" "her husband's last name". You are only Mrs. "your husband's names". Despite much that you see to the contrary, Mrs. Barbara Smith is incorrect. She would be Mrs. John Smith and Ms. Barbara Smith. Mrs. technically means "wife of...". The only time that you might be Mrs. Barbara Smith would be if you were a widow.