I had a fairly bad stroke (ischemic) a few years back. Since then, I have trouble walking up or down stairs, on uneven ground, or where I’m not looking. All because the stroke (traumatic brain injury) carked my balance. IF I concentrate and pay very close attention, I don’t stumble. He, apparently, can’t concentrate to that level. What’s his excuse?
Being 80? He’s old enough to be my father and I stumble occasionally.