My parents divorced when I was 12 (or about then) and I would guess they separated when I was 11. And while my father was around those 11 years and I was forced to see him for a few years after the divorce I wouldn't say he was a dad in any respect. Unless you consider a dad to be the person that sits in front of the TV with you occasionally offering you a pretzel but never going to a ball game or any other activity of yours.
And while there were other positive male figures around in my life you can't replace the role of a dad.
So that being said I feel I'm a first generation dad. A stranger in a strange land. Someone that has heard of the idea of being a dad, seen the concept in practice but never experienced it.