There have been and are attempts at addressing the usability gap of tech by the more tech illiterate over the years. Particularly, Linux projects such as Ordissimo[1], Eldy[2], and Endless OS[3]. I am sure there are plenty of other projects, as well (including Apple's new iPhone Assistive Access mode[4]. As sad as it may be, the market would probably be non-existent in a decade or two as newer generations enter aged care having already been somewhat familiar with computers and phone technology.
[1] https://www.ordissimo.com/en/why-ordissimo
[2] http://www.eldy.eu/
[3] https://www.endlessos.org/
[4] https://support.apple.com/en-au/guide/assistive-access-iphon...