My boy was gelded at 10. He had a typical stallion neck. Now he has a much smaller crest and his neck is much less "thick" and actually he looks much more refined in the neck now that he is a gelding. He is gorgeous. Took a little time, it has now been 3 years but I noticed significant changes in the first year and I would say he now has a nicer neck than a typical neck on a horse gelded early, but not as thick as when he was a stallion. Hope this makes sense. I also feed a pelleted supplement, like triple crown or enrich 32 with his fine grass hay. When exercised regularly his neck develops a nice arch and looks even better, but that super thick stallion neck is long gone. Gelding in my honest opinion made him even prettier, although as a stallion he was gorgeous too... Loved him both ways.