Many old farts I see on big iron dress as badly as, if not worse, than "squids." Short sleeve Ts or Harley-themed wife-beaters or sleeveless vests and a tiny brain-bucket. At least most squids use a full-face helmet if little else. Most of these guys, even knowing their own mortality and frailty, refuse to eat right or exercise and thus are borderline morbidly obese, have poor muscle tone, little flexibility etc. Their choice of machinery is not based on them wanting to be safer, it's purely a fashion statement, as is the rest of their get-up. They ride as fast (or as slow) as they do because of the heft of the machines, the lack of capabilities of the machines, their own fears/limits etc.
Not sure where this fits into the analysis. While older guys on cruisers cover more miles, the places they're doing it -- controlled access highways or secondary roads -- don't have the same risks as those faced by the urban sport bike rider. While secondary roads have junctions and intersections these are nothing like the hazards posed at urban intersections, exits from malls and plazas etc. IOW, I can cover the distance from Toronto to Ottawa and probably face a fraction of the hazards of riding from Front & Bathurst to Bloor & Bayview.