The understanding that gender is permanent throughout one's life is called

Stereotyping involves making generalized beliefs about characteristics or behaviors of individuals based on their gender. While this may relate to how society views gender roles, it does not address the permanence of one's gender identity, which is the focus of gender stability.

Sex roles refer to the societal expectations and behaviors associated with being male or female. These roles can change over time and vary across cultures, thus not encapsulating the notion of gender being a permanent aspect of one's identity.

Sex-typed behavior describes actions and attitudes that are traditionally associated with a specific gender, influenced by societal norms. While these behaviors may be consistent with one's gender identity, they do not inherently denote the understanding of gender as a lifelong, unchanging characteristic.

Gender identity is an individual's personal sense of their gender, which can be male, female, or non-binary. While it encompasses how one identifies, it doesn’t necessarily imply an understanding of gender's permanence, which is specifically highlighted by gender stability.