I also believe that "I don't give a damn" mentality has something to do with age since we acquire experience over the years. I resonate on your post so much because I am in the process of not giving a damn and to be honest, it is one of the best feelings ever. It gives me freedom and much more happiness. I always liked the idea of a "rebel", a person who isn't afraid to break the rule, especially those society rules. The world tells us to be ourselves but then it also tells us "not like that." It is ironic. Lots of people need to read your post, I bet many will find it useful. Thank you :)