No, I don't know what you mean.
I know a 7 y/o stallion who would put a lazy gelding to shame. He does NOT act studdy, has never acted studdy, has been used as a lesson horse, and he's a breeding animal.
So your gross generalization that this horse HAS to be young because he doesn't act studdy has no validation.
That horse looks a heck of a lot older than a yearling. I can usually tell the babies.
Always, I'm guessing the word is supposed to be estimate.
I'm not saying that's the only thing that mekes me think he is young. The pics are bad because they are off my phone. Trust me I have raised my mare from a very young yearling and worked with hundreds of babies before. He could be any wear from 1-4 years old. I could be totaly wrong I'm just guessing.
Yes I know that stallions can act just like geldings but if he was that nice of a stallion why would you abandon him???? Stallions that nice sell quickly around here. In fact there the only thing that sells here.