Board Thread:The Heroes of Olympus/@comment-28759193-20160617193458/@comment-28759193-20170617155758

Okay Halo has a point BUT that range you gave is a bit strict. Typically in acting, actors acting about ten years younger than their actual age is just fine. And I don't mean exactly ten years. For example, in acting, a 29 year old can pass for a 17 year old. It is fine and suited, and makeup can make them look even younger if necessary. This rule usually applies to all age ranges, except the obvious ones. Don't try and cast a 10 year old as a five year old, it doesn't work XD

Anything beyond 10-13 years is an issue though. So Logan and Alexandria will still pass.