Quality vs. quantity—it’s the eternal debate. When it comes to friendship, though, both have their place: it turns out that having lots of friends is key to a happy 20s, while depth of connection matters more than breadth from age 30 and beyond. The difference, according to researchers, is that we spend our 20s in 'identity exploration’ mode—trying to figure out who we really are by mixing with lots of different people—and our 30s settling into our true selves. However, if you feel like you could use more friendships in your life, trying socializing with others while doing your favorite activities. For example, if you enjoy biking, It can be easier to interact with someone on the bike path next you because you already have a common interest. So say hi and see where the conversation goes goes from there. How have your social life and happiness level evolved through the decades? Sound off in the comments.