We acquire our native language, seemingly without effort, in infancy and early childhood. Language is our constant companion throughout our lifetime, even as we age. Indeed, compared with other aspects of cognition, language seems to be fairly resilient through the process of aging. In Changing Minds, Roger Kreuz and Richard Roberts examine how aging affects language-and how language affects aging.
Kreuz and Roberts report that what appear to be changes in an older person’s language ability are actually produced by declines in such other cognitive processes as memory and perception. Some language abilities, including vocabulary size and writing ability, may even improve with age. And certain language activities-including reading fiction and engaging in conversation-may even help us live fuller and healthier lives.
Kreuz and Roberts explain the cognitive processes underlying our language ability, exploring in particular how changes in these processes lead to changes in listening, speaking, reading, and writing. They consider, among other things, the inability to produce a word that’s on the tip of your tongue-and suggest that the increasing incidence of this with age may be the result of a surfeit of world knowledge.

A biography of two troublesome words.
Irony and sarcasm are two of the most misused, misapplied, and misunderstood words in our conversational lexicon. In this volume in the MIT Press Essential Knowledge series, psycholinguist Roger Kreuz offers an enlightening and concise overview of the life and times of these two terms, mapping their evolution from Greek philosophy and Roman rhetoric to modern literary criticism to emojis.
Kreuz describes eight different ways that irony has been used through the centuries, proceeding from Socratic to dramatic to cosmic irony. He explains that verbal irony-irony as it is traditionally understood-refers to statements that mean something different (frequently the opposite) of what is literally intended, and defines sarcasm as a type of verbal irony. Kreuz outlines the prerequisites for irony and sarcasm (one of which is a shared frame of reference); clarifies what irony is not (coincidence, paradox, satire) and what it can be (among other things, a socially acceptable way to express hostility); recounts ways that people can signal their ironic intentions; and considers the difficulties of online irony. Finally, he wonders if, because irony refers to so many different phenomena, people may gradually stop using the word, with sarcasm taking over its verbal duties.