As you get older, it is all too easy to get in a rut- with fixed viewpoints, stuck emotions, ways of being that others can see clearly but you just think are 'right'. A life full of safe solutions. But if you start to shut out new experiences, or if you take less interest in new things, so your capacity for enjoying life diminishes. You stay in your comfort zone, and as you get older, your comfort zone gets smaller and smaller. This is harmful because you not only stop doing things that scare you, but you also stop doing things that give you pleasure.