"We can produce new brain cells and improve our mind’s clarity and focus until we die. One way to do this is to take on daily meditation, along with new learning challenges, be it chess, the ukulele, a foreign language, knitting, or by becoming a writer at the age of one hundred and six. New skills, practiced repeatedly, stimulate brain growth. But your brain also depends on cardiovascular activity to stay mentally acute and even grow. The “move it or lose it” idiom doesn’t just apply to maintaining that fit and ferocious figure."
-- Mark Divine