Kids leaving the nest...

I'm watching with interest, my kids are 19,17 and 15 - so I have a little time. All 3 of them seem inclined to move out as soon as possible. We'll see how things look over the next 5 years or so....

Honest question. When you say as soon as possible, I'm inclined to think the 19 year old would be gone then. Is it just not possible for them right now?