How old can Hibari can have eggs

Hibari usually takes three or four years to produce eggs.In different areas, the eggs are different. Usually each nest can produce 3-5 pieces, the eggs are gray, and there are brown spots on it, which will hatch after 11 days.The chicks usually open their eyes on the fifth day. They can stand up at eight or nine days, but they cannot find food. Usually, they can live independently after 10 days.