Seven would have been the correct guess. If it was 5 years ago. In Shinon's defense Silver pretty much hasn't matured at all in those 5 years. Still this was enough to offend him a bit.

"7? I'm almost 13!" he barked.

At least he was starting to grow tired of struggling his way out of this headlock. Not necessarily physically, but this was clearly going nowhere and all it was creating was a ton of frustration that currently had no outlet.