How old can I have an egg

Brother Ji usually takes more than two years to get eggs.Its breeding period is from April to June, and it usually built the nest on trees, and it is covered with some deodb, feathers, and snakeskin.Usually this bird can produce 2-3 eggs, the eggs are blue-green, and there will be reddish brown spots on it.The hatching takes half a month, usually completed by female birds, and the male birds will be guarded around during the period.