Probably not possible to determine an age or who made them. You'd need to study the context of the site and associated findings. Even then it would probably be a guess over a few thousand years, with no way of determining a "who".
A few of these look like they may have been "cores". That being, the important part was what has been removed. The flakes taken off then used to make tools.
Most of these others might fit into one of three categories.
First, hand tools, not meant to be hafted. Generic butchering tools, used as hand scrapers / knives. Not overly important, and often made and used for a single project and then tossed.
Second, trimmed stones, meant to be saved for future needs. The bad parts of the stones are trimmed off, revealing good, usable rock to be saved, brought back to camp, and available when a specific tool might need to be made.
Third, because this is a variety of good looking stone ... they would trim the stones and save them to trade with other groups. "Trade blanks", might be a good term.
Most are trimmed down enough to take the shape of "bifaces", using the term very freely. Some shaped into a (possible) knife shape, but, without very close scrutiny, it would be hard to tell if they actually were used as a knife, or if they were simply shaped up as such to be made into finished tools, later.
Neanderthal and Colorado are worlds apart, and the terms don't belong together.
The one striking thing I gather from your pics are the variety of colors, and seemingly good quality of stone. Whoever these people were, they knew how to select their stone, and how to trim it down to the good stuff.
My guess is that there are some nice specific tools to be found on this ranch. Keep your eyes open for "quarry sites" where they were sourcing this rock. Cliff sides, pits dug in the ground, or maybe even a nearby waterway where they could have found an assortment of rocks.
Also, watch for "habitation sites". Where you'll find more succinct tools. Atlatl points and knives, possibly spear points.
What seems to be lacking here, is the refined tools. The ones meant to be saved and used and kept.
Nice looking stones. Possibly dating back to a time and people that were "nomadic" who knew how to gather good stone as they roamed, but never settled for long and then moved on.