Absolutely. I wouldn't have had it any other way. Eighteen and out, is the way to go. A child should be aware of this by the time they are five.
Young children plan their lives. My eight-year-old never tires of telling me what she will be doing when she's 20. Unless you tell them how it is going to be, they'll start planning to stay home, because that is where they want to be. Then you have to do all that reprogramming when they're in their late teens, which is a messy business.
Get it right the first time! Let them know their date as early as possible.
You can't be serious!