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Some people suggest that
neanderthals are simply very aged humans. Since our understanding of the
age of the earth is really only theoretical,
we don't really know when neanderthals walked the earth. Since evolution flow is entirely theoretical, there is really no clarity that we had a common ancestry with either neanderthals or chimpanzees. More than likely neanderthals were a form of early human before some of the genetics died out of people.
See
http://www.jackcuozzo.com/.

So much nonsense in your post that I don't even know were to begin.
Neanderthals were one of the human subspecies within the same genus (Homo) as Homo Sapiens.
What do you mean age of earth is theoretical? You mean it is an estimation. The fact is that is is approx. 4.5 Billion years old.
Neanderthals became extinct about 30,000 years ago.
https://en.wikipedia.org/wiki/NeanderthalThere is no evolution flow, I think you mean evolutionary tree. It is not theoretical, it is backed by data and archaeological artifacts.
Neanderthals lived in small bands of 50-150 people who knew each other very well. Homo Sapiens invented myths which helped to organize into larger bands. Having common myth or God allowed for co-operation between strangers. Gods/Myths united strangers behind a common goal (to serve the same God for example) So their bands were larger, few thousand by some accounts.
Neanderthals were killed off by Sapiens. They were no match to a large number of smart, small ape bands. Some Neanderthals cross bread with Sapiens as the two subspecies met. That is why some of us have more Neanderthal DNA and features than others. (This guy kinda looks like one:
https://en.wikipedia.org/wiki/Nikolai_Valuev)
I suggest you think before you post. This is not your church where you can spout any nonsense you like.
You are wrong about evolution. The fact of universal cause and effect shows that everything is pre-programmed by Something. This changes how you and science generally understand evolution entirely.