I've been trying to find a word that describes someone that's older than a 'girl' but not yet a 'woman'. It seems the connotation of girl is an immature female that's still growing up. Whereas a woman ...
I sometimes get emails (e.g. from professional contacts or people I don't know well) which simply start with FirstName, [ ... letter body ... ] They don't use "Dear FirstName," or "Hello ...