I like the fact that you are grown and no longer react to everything, it shows emotional control and strength.
Also, anger is an emotion that's often triggered. People don't just choose to get angry. It's good that you could trace the source of your anger and also be able to control and manage it. It shows maturity and growth.
You are right, something triggers it but most time, what triggers Somme people's anger is something so little, it happen because they are already hurt.