Likely it is some what due to your eyes aging and some due to the brighter headlights, and some due to people not having adjusted headlights after some suspension, load, tire, or other change that affects the aim of the lights. Here in NM a lot of pick-ups have poor headlight adjustments due to oversize tires, lifts, etc.
In Europe some cars have a feature that changes the aim of the headlights for city versus country driving. Getting the driver to adjust his lights would still be an issue though. I also see a lot of drivers here drive with their fog lights on for some reason. Either they think it helps or just do not know they are on I suspect.
I flash my high beams at any cars that have lights that seem to bright. I hope they get the message and go have their lights adjusted, although I do not hold out much hope for that. I adjusted one of my cars lights after noticing people flashing their high beams at me, so I figure there may be others out there who will do the same.
5er/2500Duramax/18ftBoat