given a letter).Analysis: The largest Lyapunov exponent (Lye) and approximate entropy (ApEn) were calculated to quantify the temporal structure of variability in ankle, knee, and hip joint angles.A mixed ANOVA was used to determine the interaction between groups and within subjects.Results: Structure of variability was significantly different between groups (Lye: ankle(p<.001),knee(p=.004),and hip(p<.001);ApEn: ankle(p<.001),knee(p=.005))with higher mean values in all instances in the older group.Only the young showed significant differences between conditions (Control to PF(p=.028) at ankle, WR to PF(p=.002) at ankle, knee(p=.009)and hip(p=.045)).Conclusions: Aging impacts the control of movements with older adults showing more randomness and greater divergence rates in their joint angle trajectories.Interestingly, older adults made no significant adjustments while dual-tasking which could indicate less adaptability in walking, especially during secondary tasks