Is it wrong for a 19 yr to date a 38 yr old?

Well by definition she is 18+ which makes her legal and 100% in control of her own life.
Whether or not it is morally correct, of that I can't say anything since it's a matter of ones own opinion, but I have heard of a golden age dating rule that goes ike this " (your age / 2) + 7" which in your case would be
26 and that should be the lowest of age you could morally go down to. :sip: