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Cognitive and socio-emotional development is impaired in children with autism spectrum disorders (ASD) who have a very low development level (between four and twenty-four months). The question is to research if this developmental disturbance is the same if chronological age and the degree of intellectual deficiency are taken into consideration. This study involves sixty-nine children with ASD (nine girls and sixty boys) from seven countries, split into two chronological age groups, with either a slight developmental delay or a severe intellectual deficiency (Group 1: N = 39 ; 1 year 7 months-3 years, mean DQ = 60; and Group 2: N = 30; 8 -14 years, mean DQ = 15). The development assessment was carried out using the Social Cognitive Evaluation Battery (SCEB—Adrien, 2007). While there were no significant differences in overall, cognitive, and socio-emotional development levels between both groups, it was noted that the youngest children exhibited a more significant socio-emotional heterogeneity. Moreover, there were some differences between both groups for “affective relationship” and “social interaction” (higher levels in younger children) and “self-image” and “gestural imitation” (higher levels in older children). Assessment and intervention practices were discussed, taking into consideration chronological age and degrees of developmental delay or intellectual deficiency.