My friends and I haven't played in about 8 years and there's just so much new stuff. Is there a seed we can use to play together and basically just mine and build on that doesn't include too much of the newer stuff in the game?
Otherwise if you say what you don't like and why we can make suggestions about which seed best suits your style of play in 1.16.2 (beware that the Nether will always be new with the new biomes and new mobs).
Alot of the "new" content is pretty easy to avoid. There are things under the ocean, but if you don't care, don't go down there. The villagers are different now, which is admittedly hard to avoid. You can just walk right past any beehives you see. 1.12 added different colors of concrete, but just don't craft them if you don't want to see them. As for 1.11, you won't find a single thing from that update unless you go out looking for it. 1.10 won't affect you. The new nether is way different though. I don't know what happened before 1.10 though, so you're just gonna have to see the improvements it added.
Don't forget that aside from world generation there have been MANY changes to game mechanics since 2012 (if the OP really does mean 8 years), which no seed will be able to fix (2012 would have been around 1.2-1.4; you can find a complete list of updates here, with links to individual pages with a list of all the changes and additions, including "guides" for each major release, e.g. 1.8).