I went to a lunch today for two of Mom’s friends who are celebrating their 80th birthdays. Talk turned quickly to aging and finding secrets to health and longevity. “This is the best medicine,” said Ruth, laughing and schmoozing with her friends. She had almost stayed home but decided to push past her lethargy. “And it’s free!” said Bea, one of the birthday girls. “You should ask your doctor for happy pills,” chimed in Susie. What’s in a happy pill, I wanted to know. “Who kno