That's a healthy sign that you are willing to contact a friend that you "dissed" yesterday. I recently did the same thing. It's good to allow for the possibility of getting past unpleasantness.

I don't think it is necessarily harder to make friends as we get older. What does happen is that, as people get older, their family responsibilities take up more of their time. So, as we are getting older, people are own age can seem to have less time for us. That can make it seem harder. We have to allow for this and not feel rejected, if we have to put significant effort into connecting with others.