Every time he says anything about Biden being really old it always makes me think of my grandmothers.
My grandmother on my mother’s side died at 80 with dementia. Meanwhile my grandmother on my father’s side died at 99 and was basically perfectly normal and aware until about 2 weeks before her death, so age clearly isn’t everything.
Also Trump is clearly suffering from some kind of neurological degenerate disease and wasn’t exactly an competing in intellectual decathlons to begin with.