Hi, I'd like to put your mind at rest with regards to joining martial arts, although I am far from an expert! I joined Karate (Wado Ryu) around 2 years ago at the age of 28. I worried I wouldn't be fit/flexible/tough enough and I kept trying to put off joining. I even told the instructor that I would join when I was fitter. He told me the karate lessons would make me fitter and to stop using excuses Anyway, I joined one night and I was tired out after just the warm-up. I was bright red, out of breath and my mucles and bones ached like mad for the next few weeks. But I enjoyed it ... so I kept going back and the pain soon went and my fitness certainly increased in no time. What I'm saying is, it might be hard at first and people our age definately feel it more than say ... a ten year old but it's so worth it. When I first joined I could do only one press up. Now I can do 10 ... it's just silly little things like that which show you how much karate improves your fitness no matter what your age. Glasses won't be a problem although the sensei might expect you to take them off for sparring. Never tried private lessons. Good Luck