I've had chickens for about 5 years and have dealt with broody hens a few times. I normally keep the about 18 months then I swap them out for a new flock of chicks. This last flock I have had about 2 years and I have the strangest thing happen. The last few months I have had 4 or 5 hens go broody! It seems like all at once and I was wondering if the age of the hens had to do with their over broodyness or if it was just nature.