While there isn't one definitive age, most children develop a sense of their gender identity between the ages of two and four.
Here's a breakdown of the stages involved, according to the provided reference:
- Around age two: Children become aware of the physical differences between boys and girls.
- Before their third birthday: Most children can identify and label themselves as either a boy or a girl.
- By age four: Most children have a stable sense of their gender identity.
This means that by the age of four, most children have a solid understanding and consistent sense of their gender.