Just my two cents. There are a number of different ways in which people learn. Lots of different models. The VAK / VARK model is just one (Visual, Auditory, Read/Write, Kinesthetic). I personally think that there are numerous learning styles. I'm a big believer in Gardner's idea that there are multiple kinds of intelligence, and how we learn has to do with how comfortable we are in each of the various areas. Sure, visual, auditory and kinesthetic, but also verbal (where people learn by talking through things, as Tez and others have discussed), logical (where people have to puzzle through what they're learning until it's assimilated into some mental model or a formula). There area also people who learn best in groups and those who learn best on their own (social or solo learners). How we learn is a function of our personality, generational conditioning and aptitude. The best training is the training that accommodates all of these. I just think that the age thing is one small part of the entire package.