>I can read the grey for the most part, which doesn't seem too hostile.
for the first 30 years behind monitor (and that is if you start with perfect eyesight).
It is really hard to understand/fell issues of the others until you hit the same issues yourself. This is why there are accessibility and good (not pretty/cute/beautiful/etc.) design guidelines which one has to follow even if the one doesn't see the need for it. ~15 years ago i noticed when some of my older colleagues started to use eyedrops, to mention eye fatigue, etc. while i was easily doing 12 hours almost non-stop, and i was pretty dismissive about their "minor" issues. Well, these days, closing on 50, i understand much better what they were talking about back then :)
And for those healthy&happy youngsters who may want to walk a mile in someone else's shoes or just read a light gray text with white background :) - aging/disability simulation GERT suit:
https://diamedicalusa.com/medical-equipment/manikins/wearabl...
"The age simulation suit GERT offers the opportunity to experience the impairments of older persons even for younger people. The age-related impairments are: opacity of the eye lens, narrowing of the visual field, high-frequency hearing loss, head mobility restrictions, joint stiffness, loss of strength, reduced grip ability and reduced coordination skills."