Yes, there should be no problem with dating something that is 19-years-old when you are 30-years-old. Since the age of consent (at least in the United States) is 18-years-old.
Sure, if they can agree on the movie they want to watch.
For a 30-year-old to want to go out with someone so young says something about the supposed adult, doesn't it? I'm not morally opposed to...
The answer to this question is going to be dependant on a few things not mentioned in the question.
In most states in the U.S. the legal age of consent (when you are old enough for sex) varies from...