This year, I turn 35. This year, I will be a Dad. At 20, I could conceive of neither of these things.
In fifteen years, I will be 50. And I will have a 15 year-old daughter, unless the ultrasound tech is seeing a very girly-shaped-boy-part, in which case I will have a 15 year-old son with issues about showering after gym class (sorry son).
I can picture neither of these things either. At first this worried me. But then I realized that this is how reality works. We constantly do things which surprise the hell out of us. Before we bought our home, I could not visualize the everyday life of a homeowner. But now, it's just how we live. I snowblow, mow the grass, worry when a branch falls on the roof in a thunderstorm, paint the rooms wacky colors, and watch movies with the volume cranked up so the walls all vibrate without anybody complaining (except Jess, but that's nothing to do with the house). When I was in college, I couldn't picture going in to work every day and writing software. When I was writing software, I couldn't picture managing a team of developers.
I don't know what I'll be doing in 15 years, or even in 2, when it comes to being a parent. But I know I'll figure it out somehow. I imagine there are people who have their lives all mapped out, visualizing their futures, and are never surprised. I wonder if it's as boring as it sounds :).