Finding Your tribe: Why does making friends get harder as we grow older?

Making friends as an adult can be tough. I was lucky enough to meet my best friend in 4th grade, and we've stayed close ever since. But back in school, making friends felt so much easier. Compliment someone’s shoes, and—bam—you were besties. Now, between work, life, and everything in between, it seems harder than ever to find and keep those meaningful friendships.