I only let my broody hens hatch in spring. Imo thats the best time of the year for chicks to grow up in a natural setting. No problems with cold and nasty weather. Lots of healthy sunshine to give the chicks a good start.
You also need an indisturbed and safe place for the mother and chicks. The age is not so very important.
You also need an indisturbed and safe place for the mother and chicks. The age is not so very important.