Walter Brennan as Dorian Gray

It's even worse than we thought. Such benchmarks of mental acuity as reasoning, speed of thought, and spatial visualization all max out around age 22, and then start decaying by the time you turn 27. Professor Timothy Salthouse of Virginia University said so. The BBC published it. And I have no evidence to refute it. That explains the giant accounting error my generation seems to have made. We thought we were spending our children's inheritance, but it turns out it was our own retirement fund. Oops. Some bad math, I guess, back when we were befuddled geezers in our mid-30s.