Nicole Richie is having more fun than ever in her 40s. The 42-year-old TV star has enjoyed lots of highs and lows in her life – but Nicole has now suggested that she’s never been happier. Speaking to Interview magazine, Nicole – who has Harlow, 16, and Sparrow, 14, with her husband Joel Madden – shared: “My 40s are the absolute most fun decade, and I find myself name-dropping my age now more than ever, simply because I want people to understand the state of mind that I’m in. “I am not some 20-year-old idiot. I am a 42-year-old woman.” Nicole rose to prominence by appearing alongside Paris Hilt…