What is is it illegal for a 16 to date a 19?

In most countries, it is not illegal for a 16-year-old to date a 19-year-old. However, laws may vary depending on the jurisdiction. In some places, there may be age of consent laws that make it illegal to engage in sexual activity with someone who is under a certain age. In such cases, it is important to know the specific laws in your area to avoid any legal trouble. It is always recommended to seek legal advice whenever there is doubt about the legality of any action.