I don't normally want advice, as an adult, either!
But I certainly appreciated those conversations with my parents when younger. It helped me understand why they made their choices, and to think about what might be right for me, too.
We will just have to agree to disagree - clearly!
And this will probably make some people apoplectic - so look away now, if you're of the 'it's selfish to move away' persuasion.
We had au pairs when the DC were younger.
Over the course of the year that the girls are with us, you become close and have lots of interesting discussions about all sorts of things.
I said to them that these are their years - to go out and explore the world, explore friendships and relationships, and take whatever time they need (long or short) to figure out what's right for them. I encouraged them with exactly the same message my Dad gave me, because I appreciated it so much.
Before anyone implodes at the inappropriateness of that - we're talking about teenagers who've traveled across the world, with no-one, knowing no-one, to experience life in a different culture, speaking another language. So they have a sense of adventure and independence already.
And - also before! - anyone says they can't be very close to their families. Think again. Most of their lovely families came out to visit, and they clearly had loving, close relationships with them. Skyped regularly, etc (not 'pathetic' 
).
That's what happens when your support your children to do what they want.