From Sahih Bukhari (Hadith 974):
Narrated Muhammad:Um 'Atiyya said: "Our Prophet ordered us to come out (on `Id day) with the mature girls and the virgins staying in seclusion." Hafsa narrated the above mentioned Hadith and added, "The mature girls or virgins staying in seclusion but the menstruating women had to keep away from the Musalla
Reference: Bukhari 974