'Forever Young' is one of Rod Stewart's favorite songs and he had the opportunity to sing it with his daughter Ruby. Rod Stewart said that it means so much to him because it has to do with his kids," he told Mojo Magazine. "I suddenly realized I'd missed a good five years of Sean and Kimberly's life because I was so busy touring all the time. With these [younger] kids now I don't make that mistake -- I take them on tour with me, so I can watch them grow up. So that's another favorite. "Unfortunately, it wasn't a big hit in England," he added, "but it's like a national anthem here [America]."