From the NPR article,

If You’re Often Angry Or Irritable, You May Be Depressed

But he points out that irritability — a reduced control over one’s temper that results in angry outbursts — is listed as a core symptom of depression for children and adolescents. It has never made sense to him that it’s not included for adults. “Why would someone who happens to be irritable and angry when depressed as an adolescent suddenly stop being angry at age 18?” he asks.

me3