Why having fewer friends with growing older?

To be more specific with your words: When I was younger I knew a lot more people. After all, there were all of those people I went to school with. And after that, all of those people I worked with. As I got older, the true friendships stuck and all of those people I knew faded into a dim memory. Since I was a bit of a loner, I would say my pool of true friends has grown as I have gotten older. And that pool is still small. It has always been had to find a TRUE friend.

Yes, I have the same feeling. Most children think things in simple way. Like is like, dislike is dislike. They seldom tell lies. - I mean, when they said I like or dislike a person, they seldom think this person is rich, or are my words fit or not. They say what they think in hearts. But when they grew up, they start to think more. And they began to hide their true thoughts. And also they need to think more about personal profits. As you see, you won't show your heart to those who don't treat you sincerely. Right? And to some extent, friendship is so weak, something too utilitarian will ruin it. For an adult, it is hard to bring nothing utilitarian into a relationship, especially new friendship. So the friendship set up then, for itself, is weak and not pure. So for adults, they have more friends, but fewer true friends. Maybe that's the one of the reasons.