Yeah - young ones. I have found doctors to be the worst (at least here in the USA), I don't think they take it seriously, and don't spend enough time on it and regard everyone who isn't a doctor (or rather everyone apart from themselves) as inferior.
I taught a young race car driver - he was quick on the up-take. I had a lawyer go through in 31 days to PPL - he was very motivated (ex-green beret)and very intelligent, a joy to teach (hell, I didn't have to teach him much!). He would disappear off to the practice area and come back happy three hours later!
Motivation and willingness to learn is everything!