I'm 40. Nostalgia is a powerful drug that sells lots of magazines (look at sporting classics), books and gear. It is a drug that I'm certainly not immune to myself, and while there isn't an age I'd want I be again I wouldn't mind living in a simpler time. Experience has made me who I am today, I've often wished for a rewind button in life to make different decisions, but on the whole an exactly where I want to be. Whenever I'm feeling nostalgic, longing for the past, I remind myself that humans are wired for nostalgia and that the past want really that great. Even the ancient Romans pined for simpler times before the world moved so quickly and when men were men and women were women. (Virgils Aeneid). For a good modern view on this, watch midnight in Paris, where Owen Wilson is transported back into 1920s Paris to meet Gertrude Stein, Hemingway, and numerous authors in a golden age only to find his love interest wishes she was in the Belle epoque Paris of the late 19th century. I have a wife and 3 kids, the youngest is 4. I wouldn't change a thing