When I first learned that most people begin to experience a subtle but measurable decline in memory in their 50s, I was not a happy camper. As a baby boomer, I simply couldn’t understand why we can’t somehow manage to stay forever young in spite of the passing years. Then I learned about the important work being conducted by esteemed neurologist Dr. Marsel Mesulam at the Northwestern University Feinberg School of Medicine. He’s the researcher who coined the term “Superagers” to classify the fortunate older individuals whose memory and attention span were on par with that of a healthy, active 25-year-old. Essentially, a lot of it boils down to being willing to engage in hard work both physically and mentally. It was once believed that puzzles like crosswords, jigsaw or Sudoku were enough to stimulate the brains of older people, but current research indicates that tasks involving more effort are …