mac was correct Reconseed, in respect to our ages.
Mac: I'm not sure if Krav disciplines vary from group to group, but we had two instructors. The first was a world-renown Karate (i believe, may have been Kung-Fu) master that gave up a lifetime of work in the discipline when he realized that it didn't actually prepare students for real fights. He took up Krav Maga shortly after. Our other instructor, an awesome guy (250 pounds, very little body fat), was a SWAT team leader. It was the latter individual that I was quoting. The 'dojo' Sharp and I used to attend (school and soccer season stopped my attendance, sadly) also taught a lot of people basic survival fighting. For a, say, 40 year old women who wants to learn how to buy enough time to escape from a man trying to assault her, running away is almost the best option. Also, as a police officer, he would know that some people rush into fights because they've had training and think they can take anyone, so he wanted to instill the idea that fighting should always be a last resort no matter how good you are. I'm reasonably fit, and i'd probably have a knife, but i know that beating up the other guy is far less important that coming home to my family alive.
that said, if someone came to my school looking for trouble, I'd like to think I'd do something rather than let it happen. On a philosophical note, i suppose everyone THINKS that they'd be the one to do something, but... lets hope I never have to find out if its in me.