That's been my observation too. I don't remember one kid out of high school, or college who knew exactly what they wanted to do for the rest of their lives. (Actually one wanted to be a cop, and another wanted to be Maverick.)

As you age, you will find your interests, and passion will ebb, and flow. When I was in college, I was all about learning anything, and everything about medicine. Now, I don't even like disgusting lipid levels with family members.

In college I hated computing, and pretty much everything related to technology. I just didn't find much invented by man interesting. I felt like Programming was a waste of a life. I couldn't begin to comprehend how someone could stare into a screen for more than a few minutes. Now--I can't put this stuff down.

And to be completely honest, I still don't know how I want to spend my remaining days.