The growth of 'grey gamers', backed up with with recent neuroscience research, has led Nintendo to release 'brain training' games for the elderly. It's a package of workouts designed to reduce your brain age. This is big business with a heft £2 million advertising campaign in the likes of Saga magazine . The research comes from Ryuta Kawashima, a professor of neuroscience at Tohoku University. It'll be in the UK in June.