Aims: The aging process inevitably influences social behavior and cognition. However, a proportion of the population may resist these changes due to superaging associated with increased movement speed. Therefore, we aimed to phenotype aging animals based on their activity and determine the relationship between locomotor function and social behavior in aging rats.Methods: In 3- and 14-month-old Sprague-Dawley rats, social interaction, memory and locomotion were characterized using resident-intruder test (RIT), social recognition test (SRT) and open-field test, respectively. Animal phenotyping was based on activity level in OF using -3.5 standard deviation of the percentage of time spent in activity for the control as treshold. Behavioral parameters were analyzed using one-way ANOVA with or without repeated measures and Pearson correlation.Results: Social exploration and total interaction were unaffected in aging animals, while social play was decreased compared to controls in RIT. Aging animals discriminated new vs old conspecific in the first 3min, but not after 10min vs. control in SRT. Controls showed the opposite pattern, with tendency to spend more time with new vs. old conspecific after 10min. Total interaction was reduced in aging animals vs. controls in SRT. Phenotyping revealed two distinct populations of aging animals – both with reduced activity vs. control, but one above and other below the threshold value. No correlation was found between behavioral parameters.Conclusions: Social interaction and memory assesments were time-dependent in 14-month-old animals possibly due to the attention deficits, and independent of motor decline, suggesting the need for more comprehensive behavioral characterization and interpretation.