Jane Seymour is proving yet again that age is just a number.  During an interview with Fox News Digital at AARP’s annual Movies for Grownups Awards in Beverly Hills, the 74-year-old actress reflected on aging and shared her secret to staying confident decade after decade.  “First of all, I do my own hair and makeup,” she said with a laugh. “I figure out my own clothes, I eat sensibly, I’m never on a crazy diet and I’m very happy. I am grateful to be alive.”  “I’m grateful to have amazing work,