User blog comment:Ḡwẵine Ḹٍٍkƨ Ĺiĸe Ͼềлȑềd/Mordred's age/@comment-114.76.58.182-20111228100937/@comment-5036924-20111228144229

No, he is starting to look quite a bit older now - http://www2.pictures.zimbio.com/gi/Asa+Butterfield+Hugo+Cabret+Q+Rome+Film+Fest+hkntQ_KWnp1l.jpg

I think looks-wise he'd be fine, particularly since he's likely to grow pretty fast in the next couple of years. I presume he wouldn't have to fight hand-to-hand with Arthur for quite a while anyway, since there're plans to keep Merlin going beyond S5. I'm just dubious that Asa Butterfield would want, need or have time to return to Merlin since his career is going so well. A recast may be necessary for that reason but not because he looks too young.