Ephebophilia is when an older adult is sexually attracted to post-pubescent teenagers or adolescents—usually those in the age range 15–19. Adults with this attraction are called ephebophiles.
So if a 30 year old man or a 30 year woman masterbates to an 18 year old pornstar everyday. They’re by definition an ephebophile.
And it’s not morally wrong a 30 year old man or 30 year old woman to have sex with an 18 year old as long as the 18 year old is consenting to it.
This is more telling of you than anything. As someone in my 30s, anyone younger than 25 looks like a child to me.