I don't know about the age on the pocket knife, but the very rusty fixed blade is German made 1950's-70's.
It looks like the blade was in good condition and hadn't seen a lot of use or sharpening/ wear before it was allowed to get so rusty like this.
If you offer these up here on the forum for the cost of shipping somebody would take them off your hands, it'll never be too pretty but that fixed blade can definitely be a good functional knife again.
It's a real project knife, but it has potential.