Just finished some very long trips flying with Delta from STL to INC (via SLC), and onward (with KE) to CNX, and return 3 weeks later from CNX via INC, DTW, back to STL,
I found the Korean transient security personnel at Inchon's Terminal 2 to be highly unfriendly, uncooperative, and frankly very rude. My wife and I are both in our eighties (definitely considered elderly), and are not accustomed to be told in a very loud voice to remove our hats,belts, shoes, jackets, and "everything which can be removed", in an airport TSA environment (especially since we came out of a known secure area and going back to a secure area) !!!
I personally was chastised loudly by two Korean TSA agents (one male; one female), across the security table, because I had overlooked a cloth hanky and two wrapped wooden toothpicks in my shirt pocket. Also, there was no attempt made to help us obtaining any of the inspection trays, which had to be picked up from the bottom of a table, and then placed in separate transport trays/bins. In my case three trays, and for my wife four. This was very surprising since Asian cultures normally treat elderly people more respectfully, and usually offer any assistance and courtesies if someone appears to require help.
Finally, there was a lot of walking required from the incoming Delta gate area, to transient security, and then onward two our Korean Airline connecting flight onward to Thailand. Should we be privileged to live much longer, and consider perhaps another trip to Asia, we will definitely avoid transiting the airport at Inchon Korea. We are very disappointed to having had such a negative experience, but wanted others to know what elderly travelers may encounter, if transiting through the very large international airport at Inchon Korea.