User blog comment:Omega natsu2/Chapter 390: The Story of a Boy, Predictions./@comment-5593752-20140620081741/@comment-4449950-20140620081956

I don't think so personally. Gray would be 25 if he wasn't frozen and we've seen how Mashima ages 20-25yo's through Jellal and Lyon, who look pretty much the same, if not a little less boyish and more angled. Silver to me looks more around Gildarts' age: 45ish.