<Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> Gender identity is one's personal experience of one's own gender . Gender identity can correlate with assigned sex at birth, or can differ from it completely . All societies have a set of gender categories that can serve as the basis of the formation of a person's social identity in relation to other members of society . In most societies, there is a basic division between gender attributes assigned to males and females, a gender binary to which most people adhere and which includes expectations of masculinity and femininity in all aspects of sex and gender: biological sex, gender identity, and gender expression . In all societies, some individuals do not identify with some (or all) of the aspects of gender that are assigned to their biological sex; some of those individuals are transgender or genderqueer . Some societies have third gender categories . </P> <P> Core gender identity is usually formed by age three . After age three, it is extremely difficult to change, and attempts to reassign it can result in gender dysphoria . Both biological and social factors have been suggested to influence its formation . </P>

What does it mean to identify as a gender