Throughout the research literature and in the area of countermeasure development there has existed a marked propensity to evaluate impaired-driver collisions as a distinct subset of the total collision population. Similarly, then, the collisions of non-impaired drivers represent an equally distinct, yet perhaps qualitatively discrete sub-population. This paper presents a preliminary analysis of the characteristics of the collisions of three different groups of non-impaired drivers, who are differentiated a priori on age-related factors. Various features of the collisions of these groups are examined, primarily to determine those instances in which a group is overrepresented on some factor. On the basis of such comparisons, "profiles" are derived for the collisions of inexperienced and aging non-impaired drivers.