iPad apps especially for Seniors??

I wondered if there are any iPad apps that would be especially useful for people over 55, so i searched the web for  "best apps for ipad for seniors". Sure enough, there are many many lists: "16 helpful apps for seniors", "27 bet iPad and iPhone apps for senior citizens".

But are any of them useful.. and how many of these apps are FREE..?

Well, some of them are designed to help people by improving things like:

• Visual accessibility: Silver Surf is a web browser with "large navigation buttons, dynamic text zoom, high contrast viewing".
• Your brain fitness: Lumosity is an app for keeping your brain fit and healthy.