Age is not a limitation in bitcoin, I know that an only person might not be interested in reading so much about bitcoin or knowing what's in its whitepaper, so I think basic knowledge or information is okay for them which is how to buy bitcoin, about exchanges and all those little stuff, but when the subject of investment comes in, we know that bitcoin is best approach with a long term mindset, but if they are already retired and very old would it still be a good advice for them to invest long term?