Walking and cognitive performance in adults with multiple sclerosis: Do age and fatigability matter?

•Ambulation and cognition worsen with age in adults with multiple sclerosis (MS).•Fatigability might influence such age-related worsening of ambulation and cognition.•This study tested possible age-group differences in fatigability in adults with MS.•There were no significant age-group differences in walking/cognitive fatigability.•Fatigability may not explain age-related declines in walking and cognition in MS.