Soap Opera Rapid Aging Syndrome (also SORAS or rapid aging) is the term used to describe the aging of a television character (usually an infant or child, but also sometimes a teenager) that is faster than they should be aging, given the timeline of the show. The process is usually done to allow for more rapid character development, and to allow the writers to develop new storylines for the character.

(merlin never ages.)

I think I acquired this at the age of twenty-three.