I wanna be an Astronaut...when I'm thirty.

Ryan has had the dream for a couple years now to be an astronaut when he grows up. Actually, he says that he is going to be an astronaut when he's thirty. It's amazing to hear him talk about it, and the questions he asks are so smart. I have mixed emotions at this point about it. On one hand, I am going to encourage him to reach any goal he wants. Afterall, I'm his mother. I am going to fight for what he wants til the day I die. But, I worry that there may come a time where some of his dreams are not going to be a reality, and how am I ever going to tell him? I hope and pray that day doesn't come but the reality of having a kid with special needs is that there ARE going to be some things in life that just aren't possible. How do I prepare for that? Obviously, at his young age, there is so much hope and potential for him and with increasing information, there is going to be a vast world for him. But as he grows older, smarter and more aware, he is going to want things that may not be feasible for him. I don't know how I'm going to do it.