I agree, tho he probably went through some training program & in truth, some people never outgrow a hot head. Thing is, by selecting those who are a bit older, it's easier to tell.
With brain studies which show that the pre-frontal cortex (the area of the brain involve with rational thought and emotional control) not maturing until the mid 20’s you’d think that such high stress jobs would take the age factor into account in the hiring process.