College is a great environment for making friends: lots of people with similar life experiences all jumbled together working on a big thing, and bonding over the stress of it. After college, you’ll have to work at it a little harder. Find the people who are interested in what you’re interested in and hang out with them. Invite people for drinks. Don’t get discouraged if it gets harder to schedule, because people will be busier as you get older. And if you can recreate the conditions of sentence 1, or some of them, you’ll always have the chance to make more life-long friends. But, simply, take the first step.