Back in the old days tools kept in my old shed never rusted, but some of my more recent ones like chisels and the like now do. The daft thing is that even those kept in the house start to go rusty. Do they make them from different material more recently? By recently I'm not talking really new ones, but ones bought in the 80s against ones inherited from my grandparents, which never rust. The chisels and saws are the most obvious.
As an aside I get the distinct feeling that ordinary sets of twist drills these days are worse. They seem to be made in two extremes, so soft they bend, or so hard they snap at the slightest thing. I still do some DIY even though I cannot see, but am mindful of the dangers of very sharp objects and power tools of course! Brian