The only reason that you can't teach an old dog new tricks is if the dog gives up on learning. Where I have found difficulties is in exploring some of the latest developments. Things that were very advanced when I was at school, have now become part of a basic education. However, many of the basics are no longer taught, and people now assume that things just work without understanding why.
Another thing is that I have become interested in the origins of the so called deep state, and I've tracked it back to the Knights Templar. It's probably a bit easier for me, as I have spent a lot of time in regions where their history has been preserved. Most people today just dismiss this as conspiracy theory with no foundation.