Hasan Basri radiyallahu anhu says that an old woman came to Rasoolullah sallallahu alaihe wasallam and made a request, O Messenger of Allah make Dua that Allah grants me entrance into Jannah.Rasoolullah sallallahu alaihe wasallam replied, O Mother, an old woman cannot enter Jannah. That woman started crying and began to leave. Rasoolullah sallallahu alaihe wasallam said, Say to the woman that one will not enter in a state of old age, but Allah will make all the women of Jannah young virgins. Allah Ta'ala says, Lo! We have created them a (new) creation and made them virgins, lovers, equal in age. (Surah Waaqi'ah, 35-37).
English reference: Book 35, Hadith 230
Arabic reference: Book 36, Hadith 240