Back in early January, before COVID-19 was as familiar as the furniture, I went in for my annual physical. My doctor looked at my test results and shook his head. Virtually everything was perfect. My cholesterol was down. So was my weight. My blood pressure was that of a swimmer. A barrage of blood tests turned up zero red flags. “What are you doing differently?” he asked, almost dumbfounded. After all, I’m a 67-year-old balding guy who had spent much of his life as a desk-bound journalist dealing with nasty ailments like hernias (in my 30s), kidney stones (40s) and shingles (50s). I ruminated over what had changed since my last physical. Sure, I exercise more than 90 minutes daily, but I’ve been doing that for five years. And yes, I watch what I eat, but that’s not new. Like most families with college-age kids, mine has its share of …