Who is a technical diver? Compared to some, I am a very technical diver, compared to others like George, I am a complete novice. Many of us do technical things, and utilize advanced techniques, but it is dangerous to block out age groups and or agencies to determine someone's quality or worth as a tech diver. If you look at the GUE site, you will notice that they recommend that Divemasters or higher, preferrably instructor/leadership level divers who have the right mindset pursue technical diving. Most young teens/early twenties divers think too much with the wrong head. Not all, but many. That is dangerous. That is why the level of commitment to training, education, knowledge and application of that knowledge makes the difference. yes an 18 year old can do it, but rarely. He/she may think they are doing it (common god way of thinking at that age), but usually get themselves into trouble. On the other end of the scale I know some divers in their late 40s and 50s that are complete strokes and feel that their age has somehow evolved them into a higher being. Equally as dangerous. Think safety first, then have fun. Do what you need to do to explore, enjoy or research something. Doing it just to do it is macho, not smart, and that is definitely NOT a technical diver.