Under 5's will not be admitted to the event since it is widely agreed that the site is not suitable for young children and babies. 

Half price 'children's tickets' will be available for 5 to 12 year-olds at the gate as long as they are accompanied by a person aged 21 or over who is already in possession of their full price ticket and who takes responsibility for them throughout the event.  Anyone aged over 12 and under 16 must purchase a full priced ticket in advance and must be signed into the event by a person aged 21 or over who must again accompany and take responsibility for them at all times.