Late-cueing of gait tasks on an uneven brick surface impacts coordination and center of mass control in older adults

•We investigated the effect of late-cueing and surface irregularity in older adults.•Segment coordination, kinematics, and trunk-accelerometry were analyzed.•Only young adults increased shoulder roll for late-cueing on uneven surfaces.•Older adults reduced stride regularity (late-cued) more than young adults.•Older adults with strength and balance deficits were challenged.