True so far in my experience (35 with friends of every age level.) But there are also many solutions to loneliness. My engineery brain solved it for me by figu

True so far in my experience (35 with friends of every age level.) But there are also many solutions to loneliness. My engineery brain solved it for me by figuring out that inviting people to group events, preferably ones that represent mutual interests, is a good foot in the door. Once your confidence increases a bit you can pursue deeper relationships with some of these people, as well as further amplify your results by actually organizing something you're interested in that has reach outside of you -- think of a meetup group or business/technical community. Eventually you have hundreds of acquaintances, many will cheerfully meet you for the occasional coffee or beer, and you can start being selective about who you spend time with based on deeper shared connections. (Prior to that you'll probably have to put up with some colorful characters and learn to limit the damage they do to you.) Not claiming to have made any of this up or that it is easy, it's hard, it takes years, it's been talked about it before. But I think I summarized it pretty well there (there are many more nuances to learn of course).