Your metabolism may never be better than it was at 21, but psychologists have proven that the brain ages gracefully – up to a point. There’s no one peak age for intelligence, but rather various stages that adults pass through. 19- and 20-year-olds have perfomed best at simple number tests. “Working memory”, or your ability to remember and manage tasks, is best in your 20s in 30s. Vocabulary, however, gets better as we age. So no matter how old you are, your brain is intelligent in its own way.
MORE: 5 Apps to Make You Smarter