"The only thing that is constant is change."
~Heraclitus~
And it's not our fault that we can't anticipate how life will change us and grow us, but we need to remember that likely possibility when we try to lay down our future plans in permanent marker. When we finally get there, we may end up wanting something entirely different than whatever we were able to anticipate.
I plan for the future but allow for the possibility of a change in heart or a change in mind or a change in me.