I believe that two adults who both consent to a relationship should be allowed to be in it, regardless of age. But I can also understand some hesitation in approving a relationship between someone aged 30 and someone aged 19. Someone who is 19 IS legally an adult, but at that age, their brains are still developing and many of them lack the maturity of someone who is 30, solely based on brain chemistry. I honestly would have a hard time understanding or even trusting a 30 year old who would date a 19 year old, since I would assume the 30 year old would realize that the 19 year old was still growing and changing and probably not ready to date someone who's an actual functioning adult. Age difference doesn't matter to me, it's only the idea that someone that young isn't done mentally developing yet.