Usage of and equivalents of Sir

According to Wiktionary:

Noun

sir or Sir (plural sirs)

• A man of a higher rank or position.
• An address to a military superior.
  Yes sir.
• An address to any male, especially if his name or proper address is unknown.
  Excuse me, sir, could you tell me where the nearest bookstore is?

I assume you'd not use this for young boys for example, and certainly not for girls or women. In what circumstances are sir the right one to use, and are there alternatives when it's not?

Solution 1:

The forms of address, "sir" and "ma'am," are still very much alive and well in American English usage. "Miss" is the correct substitute for women who are younger and/or likely to be unmarried. There is nothing archaic about them. As noted above, they are used when situations require a bit more formality: addressing strangers; customers in a retail environment; police officers; and social and workplace superiors in more formal settings, though not for long after acquaintance is established. Especially in southern parts of the US, and in rural parts of the East and Midwest, I am certain from long experience that they are very much in common use.

It should not be used to address boys or girls. "Miss," is very proper for girls in these situations, though for boys, "master" is certainly archaic. Boys might be addressed as "sir," once they are old enough to wish to be thought of as men. I wouldn't hesitate to address in that way, say, a nineteen year old. Younger boys might be addressed less formerly as a matter of course, "kid," (paradoxically) "man," "dude," and so on. It should also be noted that in the US, the term "boy" has a racial history and should not be used as a form of address except with intimates, such as one's son or nephew - certainly not with strangers and never with members of racial minorities by Caucasians.

Solution 2:

In the USA where I live, "Sir" (and the female equivalent, "Ma'am") are just general titles of respect. They do however tend to imply that the speaker is younger than the recipient (I guess since we don't have official social classes). This isn't a hard rule though.

I noticed my father regularly using "sir" and "ma'am" for pretty much every adult he encountered. Once I got old enough, I started doing the same. In my book it is a small sign of respect, which is particularly important in dealing with strangers. People can get unsavory ideas about how you probably feel about them when you are taller, maler, or (in the USA) lighter-complexioned than they are, or in some other position of social power over them (eg: customer over clerk). This helps defuse that a wee bit.

You are right that there are some times it is inappropriate. For example, I had to be very careful with "ma'am" when I was younger. Some women would get very offended at the implication that I felt they were far older than myself. I understand that "sir" is also a no-no for addressing an enlisted man (only officers are supposed to get that title). I do some military contracting, and have to watch out for that.

Solution 3:

The use of sir to address someone is pretty archaic in Britain now. It might be used in letter writing, where it would usually appear in the form "Dear Sir/Madam", where the identity of the recipient is unknown. It may be used by staff in shops and restaurants, but again this would be quite formal (and mostly employed when politely refusing to do something the customer wants).

Knights of the realm, those knighted by the Queen, have their names prefixed by Sir thus, "Sir Terry" for Terry Pratchett, for example. (Someone with more leet etiquette skills than me will need to confirm whether Bill Gates can be addressed as "Sir William". I expect not, as the knighthood in his case is honorary - a genuine knighthood can only be bestowed on British subjects.)

The corresponding archaic/formal terms of address would be

Sir - for an adult man 
Madam - for a married woman or older woman (1)
Miss - for a girl or unmarried or young woman 
Master - for a boy

Note that using these forms of address outside of the contexts listed above will get you funny looks. They aren't really used except in those specific contexts. In particular "Master" would only ever appear on very formal correspondence, such as if the Queen was inviting a young boy to a garden party, and would be unlikely to appear on its own ("Master Robert"). You'd probably have to go back to the early to mid 20th Century for them to be in common use.

(1) 30 seems to be about the time I started to get referred to as "Madam" rather than "Miss", although often people simply stop using these forms of address, as some women can be a bit touchy about the "wrong" one being used.