Just checked the wikipedia article on this, and it seems that self-citations are not excluded from the h-index. This makes me a 7, due to my relentless self promotion.
H-index is not perfect by any means and is heavily biased towards older researchers (famously Galois’ h-index is 2). Field also seems to be very important: I work in a field of engineering where people publish a lot of relatively short papers (15 papers during my PhD while being distinctly mediocre) and have got to a 7 in 4 years, this is pretty much impossible in a field like biology or maths.
67 is really impressive! How long were you at it and what field were you in djaustin?