I tend to notice people not giving a quick nod/wave/indicate when on the road as much as they perhaps used to.
I’ve also noticed over the last few years that people seem to scythe down slip road paying no attention to who/what is on the main carriageway and try to join regardless. Woe betide you if there is a car overtaking you, while Mr Jonny Big Bollocks attempts to join the main carriageway from your left hand side and wants to use exactly the same space that you are occupying! I did wonder for a while whether the Highway Code had changed to give those joining priority.
As for people in shops, don’t get me started! I did wonder if it was just me who thought that my primary job when shopping was to hold the door for feckless minions who then wander through as if it’s your duty to allow them free passage, without so much as a glance.
I have also wondered whether I am getting grumpier in my (not particularly substantial) old age. 😀