if she is 16, and he is 19, is it illegal to have sex or any sexual contact with that person....can you tell me the penalties if so.....

The law that sets the age of consent at 18 is one which was passed quite some time ago and prohibits sexual intercourse with a person under 18 "of chaste life." Because of the wording of the law, it isn't actually enforced, so practically speaking, 16 is the age of consent is Massachusetts. But the law does exist, so the age of consent is listed here as 18.