I have one hen like this I hatched this year, parents are both IB, I posted pics a month or so back, never really got a definite answer, neck feathers on mine are blue/green, the body color of mine is like yours. My other peahens are darker, grey in color.
Here are a few pics of her in the sun, she doesn’t look like any other IB I have, she is very light colored compare to a IB, She is the same color down her breast. The color neck feathers may have a green tint not blue
There is no minimum, they are straight run, not exactly sure on life expectancy, but i know it is quite awhile. They will have to be picked up, i do not ship. I live in Greenvile, MS