I am actually 32....seems it just gets worse as I age as well. As far as growing up, not much else I can grow up in; I have a career, married, mortgage, etc. Its just anger that builds up from people being selfless pricks, and it is just something I can not control; believe me, I tried. Riding my bike seems to help quite a bit since it clears my head and thoughts. Could be just straight up I have anger issues and need to perhaps go to some classes.