I once sat in the cockpit of a WWI fighter plane; remarking upon the oh so flimsy constructiuon I said to the owner "I would have sh!t myself out of fear", he just answered:
"don't forget, those guys were very young men. They didn't know what fear is."
I watch Kermit Weeks Fantasy of Flight videos on You Tube.
He has a lot of WW1 planes [some replicas] as well as some older ones. Then a variety of WW2 stuff as well as a Sunderland Flying Boat and a Super Constellation. And some very interesting restoration videos as well.
You should go have a look, just search Kermit Weeks on You Tube.
With those WW1 planes they were the height of technology of the time. Ask many modern pilots to fly a DC3 and they would think the same. Yet they are still working in many places.