What @Narkle said!
I've had my life planned since early childhood. I knew what career I wanted from an early age, chose my options to fit that career for GCSEs and A-Levels, applied to the appropriate universities with that aim in mind.
I knew I wanted marriage and a family, and the type of man I wanted them with. Granted, I made a mistake the first time around, but I recognised it and fixed it.
I planned children and the time in my life at which they would be most suitable, and had them (more or less - DS1 surprised me by being conceived 6 months early but my plans have wiggle room!)
Between us, DH and I have planned our house moves, our country move, our life goals. We go over them regularly to make sure we're going in the right direction with them all. We have backup plans and contingencies which I think are the key. Make plans, work towards those plans and be flexible enough to change your plans as and when life dictates.
Ultimately you can never know what's going to hit you - I could be knocked off my bike tomorrow - but it's (imho) unrealistic not to make plans for your future because they may not eventuate.