I like getting older. When you're in your twenties you're really forging for your future. Things take shape later on.
That has to remain the principal reason for doing it, doesn't it? I know it's possible to write for money, and many very good writers have done so. But for me, it has to remain the principal thing that I actually want to do the writing.
The cynical part of the answer is that I expect to see a good deal more space opera, set far enough in the future as to be disconnected from contemporary issues.