As a human and as a social creature, sometimes we really want to relive the memories that we have with our childhood friends, especially the nicest ones. Let's say not the childhood one, the recent one is in Senior high school maybe when you start to know what is friendship, life, and some other stuff.
But as you get older, you encounter so many different things, interact with so many different people, and ultimately fall into different luck and life experiences, you will notice that some people will change, and then when you have time to meet up again, you will feel that the people that we know has changed, and that is ok.
That is because we undergo a different life experience, which somehow changes ourselves and our friends , so when we meet up again we are already two different people than we used to know and understand years ago. Yes there will still be similarities, but mostly you will feel the changes.
it is not necessarily they are bad, or we should reject the changes, but it is part of life, as long as you remember the fun that you have in the past that is the things that matter. Because past that stage, we have already follow a different footpath, and when the path cross each other, we already have a lot of other things in our pocket and our soul that makes us different, and that is the things that we should embrace.