I completely disagree with that theory. It doesn't lessen with age, it lessens with circumstances. I was completely fine for over twenty years and then I pushed myself to make a friend and have been a mess ever sense. All I can suggest is be happy with yourself as much as you can and don't worry about friends too much. I would also take up meditation and such if you haven't already. I've been a real mess the last few years, and it is the only thing that has helped at all. It takes work. It's not an easy way out, but it helps me and a number of others very well. If you'd like some resources, let me know.