Do bones maintain whatever properties they're exploiting thousands of years after the animal's death? I'd expect they'd have different wear or fracture patterns

Do bones maintain whatever properties they're exploiting thousands of years after the animal's death? I'd expect they'd have different wear or fracture patterns if they were very old when worked. You'd also expect a mixture of ages in close proximity. Even if all the bones being processed were old at the time, they presumably would have a mixture of 100kya, 50 kya, etc. bones jumbled together.