The University of Cambridge has 31 colleges, founded between the 13th and 20th centuries. No colleges were founded between 1596 (Sidney Sussex College) and 1800 (Downing College), which allows the colleges to be distinguished into two groups according to foundation date:
The oldest college is Peterhouse, founded in 1284, and the newest is Robinson, founded in 1977. Homerton, which was first founded in the eighteenth century as a dissenting academy (and later teacher training college), attained full college status in 2010.
All 16 of the "old" colleges and 7 of the 15 "new" ones admit both male and female students as both undergraduates and postgraduates, without any age restrictions. Eight colleges restrict entry by sex, or by age of undergraduates, or admit only postgraduates:
No colleges are all-male, although most originally were. Darwin, founded in 1964, was the first mixed college, while in 1972 Churchill, Clare and King's colleges were the first previously all-male colleges to admit women. The last all-male college to become mixed was Magdalene, in 1988. In 1973 Hughes Hall became the first all-female college to admit men, and Girton admitted men in 1976.