A lot of it would depend on what mutation Lorenzo is. Bennie is a pearl pied and still has some ghost pearls. Because he is pied, he still has light colored spots elsewhere. I have never had a normal gray male; but I would think they'd lose their "baby spots" at about a year.
Lorenzo was a pet store bird. He was the only normal grey. All his siblings were white face greys. So I'm not sure if he is split to pied. I was just curious because he literally hasn't lost any of his spots.