In the 1940s there was one occurrence for approximately every 250 pregnancies. This rate has since dropped to between one and six occurrences for every 22,000 births.[3] The average age of the affected woman is 33, though cases have been reported for girls as young as 6 and women as old as 79. More than two-thirds of women who experience pseudocyesis are married, and about one-third have been pregnant at least once.