You're not obliged to divulge personal details regarding your age, ethnicity, gender, religion or sexual orientation, and so shouldn't be asked to do so here. Only include information that you feel would help with your application and support your suitability for the role.
You may be asked to complete an equal opportunities form. This information is treated confidentially and will not be used as part of the selection process. The form is normally separate from the application, and used solely for monitoring the employer's commitment to equality and diversity.