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Obviously I have a lot of friends who are over sixty, and not many seem to be able to understand the concept of virtual assets, even when I cite the examples of stories, and fiat currencies.
they probably think that them, being old, doesn't need to learn something new. they could probably understand it if they are actually interested in it. I remember my grandma(she was 80 when she started asking me) wanting to learn the latest trend in technology. she would ask me or my sister how things work on a cellphone and what apps are trending or being used by me, my siblings and my cousins. so she could stay in touch with all her grandchildren or at least understand what they are doing or talking about. what I love the most about it is that she can understand the latest slangs and laugh with us.
If you are sitting in front of a screen for long period, don't start at it solidly, but look out of a window frequently, and focus on trees and houses in the distance. Get up and walk around now and then to give yourself a break.
this is what I usually do. at a young age, my eye already started to blur, what's worse is that my job requires me to be in front of a computer screen most of the time. my eyes starts to hurt if I looked at a computer screen for 5 minutes straight.