My dad has a Clovis spear point made of flint that is about 13,500 years old. It would work just as well today as 13,500 years ago when it was made.

My point is I think what was made a couple of centuries ago, by it's very nature is going to last generations when used by responsible people that care for their tools. I am sure that there are thousands of razors that did not make it based on abuse or some other factor.