I have some GTD taps and dies that are 30 years or more older than I am, and I am 65. Also taps and dies from Morse, Card, Threadwell, Lucky, Butterfield, Handy, Pratt & Whitney, Vermont, Winter Bros., Bay State, Star, and others. Some of those are from the turn of the 20th century. Even a few handmade taps and die plates, no markings, obviously handmade, crude but usable. Unknown sizes, unknown provenance. I got lucky and made a major haul of them at an estate sale. I sold about 200 taps and about 100 dies after sorting down from the ones that I thought were the best. All of them were minimum 50 years old and in very good condition, and cleaned up nicely.