Mine is about 8000 years old. Heat treated chert. Traded for it in grade school a long time ago and hung onto it over the decades. Sits quietly in my corner curio cabinet.
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I can't guess the age of that, not without knowing in what area it was found and no longer having access to the written reference library. So without knowing more, I'd call it an archaic projectile point. The Archaic period lasted from, as best we know, from 8000 BC to 1000 AD. Having archaeological references from the specific region where that tool was found could narrow the date further.
So your 8000 year old tool might only be 3000 years old.

It's certainly not an "arrowhead" though. Bows and arrows didn't exist back then, and it's way too large. I wouldn't call it a knife either, since it was designed for thrusting or throwing and not cutting.
The material is correct, chert. It might be possible to specify it as a particular type of chert; some cherts can be traced to specific areas or even specific outcrops.
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There are many older stone tools found in North America, namely tools from the Paleolithic period. In fact not far from here is the famous Folsom site, and the namesake Clovis site is a couple hundred miles south of here. Although difficult to establish exactly when the first Paleo people appeared in North America, it's generally accepted to have been 10,000 - 20,000 years ago, and there is plenty of evidence to support that range. The difficulty is the hype and glory given to each subsequent "oldest" discovery, but not much hard data to back up specific claims. It'd be nearly impossible, for example, to say that Site A in Utah is 500 years older than Site C in Texas.
Less common are the tools from the transition period between the Paleolithic and Archaic periods. The Dalton point type is perhaps the most well-known example.
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