Same as a lot of the above in terms of the physical aspects. But one type of thing I hadn’t anticipated: Decline in international cooperation and social responsibility. I grew up in the end of WWII when there seemed to be a lot of interest in international cooperation, UN, learn about and respect other countries and customs. Be law abiding, , help others.
Then watching the rise of “me first”, more conflicts and more vicious ones, people feeling and acting as though laws didn’t apply to them. No apologies for errors that affect others. Internal conflicts.
Of course there are lots of exceptions,but I’ve developed constant vigilance, getting tripped up once in a while by still being trusting. Having to check up & investigate on things I used to take for granted.
It can be very tiring and draining.