Of course gender is about women, but more importantly it is about women and men, young people and old. Whilst 'sex' refers to the biological features of a 'male' or 'female', 'gender' has more to do with social behaviour and relationships.
Gender looks at how men and women relate to one another , and their different needs and experiences.
But it also highlights inequalities between all people. For example women of different ages may have different levels of authority and be given different roles and responsibilities. So gender deals with power between people and asks questions about why women and girls are so often denied access to opportunities, and resources. Most importantly a gender approach recognises that societies build ideals and norms about men and women, some of which need to be challenged. Gender comes into all areas of relationships and sexuality.