“Aging is not for the faint hearted,” my grandmother told me as she took cautious steps from the car to the back door of our house. I was 6 then, and she had just turned 60. Things have changed. People say 60 is the new 40. To support that claim, this year’s National Women’s Health Week spotlights energetic older women who participate in 5K and 10K races, triathalons, and marathons.