Is an attraction to incest porn (legal age) a normal thing?

It's of concern: I guess i would say that "normal" and "healthy" are two separate things. It may not be a particularly healthy thing for a person to have fantasies involving incest. It seems as though you already have a concern or else you wouldn't be asking about this. I wonder if you could have been sexually molested as a child by a relative? There are therapists with special expertise in this area. Good luck.

Finding help: Here is a good organization that helps victims of sexual abuse: http://www.Rainn.Org/get-information/types-of-sexual-assault/child-sexual-abuse.