Womanhood is the period in a human female’s life after she has passed through childhood and adolescence, generally around age 18.
The word woman can be used generally, to mean any female human or specifically, to mean an adult female human as contrasted with girl. The word girl originally meant “young person of either sex” in English; it was only around the beginning of the 16th century that it came to mean specifically a female child. The term girl is sometimes used colloquially to refer to a young or unmarried woman; however, during the early 1970s feminists challenged such use because the use of the word to refer to a fully grown woman may cause offence. In particular, previously common terms such as office girl are no longer widely used. Conversely, in certain cultures which link family honor with female virginity, the word girl is still used to refer to a never-married woman; in this sense it is used in a fashion roughly analogous to the obsolete English maid or maiden. Referring to an unmarried female human as a woman may, in such a culture, imply that she is sexually experienced, which would be an insult to her family.
There are various words used to refer to the quality of being a woman. The term “womanhood” merely means the state of being a woman, having passed the menarche; “femininity” is used to refer to a set of typical female qualities associated with a certain attitude to gender roles; “womanliness” is like “femininity”, but is usually associated with a different view of gender roles; “femaleness” is a general term, but is often used as shorthand for “human femaleness”; “distaff” is an archaic adjective derived from women’s conventional role as a spinner, now used only as a deliberate archaism; “muliebrity” is a neologism (derived from the Latin) meant to provide a female counterpart of “virility”, but used very loosely, sometimes to mean merely “womanhood”, sometimes “femininity” and sometimes even as a collective term for women.
Menarche, the onset of menstruation, occurs on average at age 12-13. Many cultures have rites of passage to symbolize a girl’s coming of age, such as confirmation in some branches of Christianity, bat mitzvah in Judaism, or even just the custom of a special celebration for a certain birthday (generally between 12 and 21), like the Quinceañera of Latin America.