Or you could just log in to the site each time instead of using an app. Not as easy maybe but just an option🙂.
good thought. Long before app versions were common for sites there were mobile friendly versions. Back in 2011 I would get on a website on my android and it would be impossible to read...and really far out image of the site, but if I double tapped it would zoom all the way in and then reorganize itself reasonably well.
The only super hard part was typically logging in, but that's not every time anyway.
I would also be pretty surprised if there weren't ease of access options on an Iphone for elderly people, so if Iphones weren't mobile friendly barring an app, there should still be some workarounds.