When was the last time you sat down with your (grand)parents and tried to help them learn how to use a new app? Everyone who’s been there can recog...
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Do you have the ability to do some user studies and get actual feedback from your target demographic?
I would start with larger UI pieces and a clear typeface in general, but even then it takes some trial and error and that's where true user feedback can really help you.
No unfortunately I don't have that kind resources to do a thorough user studies.
Thanks