What age to cosplay kingdom hearts?

I don't know how old/tall Zexion is, but Sora is really ok.Even if you are not tall,Sora is not a really tall person.And as long you are having fun,it doesn't really matter.If you want to cosplay them,don't bother with such things,cosplay is just for fun and it's totally impossible to be exactly like the character.If you want my own experience,I'm not tall but not short,14 years old and will be cosplaying Roxas[from kingdom hearts] soon because I really want to do so.