Big targets and no mistakes: why the parent's screen has nothing to break
Fitts's law and the 44 point guideline explain the big buttons, and the fear of breaking something explains why none of them can touch the schedule.
One screen, no menus: why your parent's side of Marlow shows so little
Choice, working memory and attention all get more expensive with age, which is why the parent's screen shows today and what is next and nothing else.
Why the type on your parent's screen is so big
What happens to eyes after 60, what the contrast guidelines actually ask for, and why the two halves of Marlow are set at different sizes.
The research we followed when we designed your parent's screen
What published work on older adults and technology says, and the specific choice each finding led to on the side of Marlow your parent sees.