The Old Guard (2020)
https://www.imdb.com/title/tt7556122/
Once more I had the choice of watching some 70s exploitation film or something new from netflix and I somehow ended up randomly selecting the netflix offering despite them rarely impressing and very much enjoying cheese.
Really long film actually, don't know if it was a cut down TV series effort or what.
Anyway general premise is a bunch of people that take damage but regenerate fast (though might eventually stop having the ability) have been around for centuries making the world a better place. They however are then brought to the attention of a big pharma company (and to be fair he who offers immortality is easily the first multi trillionaire).
End result. Entertaining enough if you don't think about it, which is more than I had to say about the last one. If you do then potentially millennia long warriors are good but nowhere near what I would expect. Barely any intel, barely any surveillance, no armour, bunch up like grapes, lean way too heavily into their regen abilities, their hideouts are shockingly poor (I don't live in a fortress but could do better with the stuff I have to hand right now in about 30 minutes, never mind if it is a proper hideout), their enemies despite knowing their abilities and having enough resources to account for it don't play to it...
It is a premise that has been done before on several occasions. Highlander being among the more notable but it is probably closer to the TV series Painkiller Jane from a few years back that I actually quite liked and explored things in more depth there (though that is only the one "immortal" and a team with her). Broadening it a bit then any kind of I R cyborg robot and hardnut type film/anime/whatever, or possibly even I R good vampire probably scratching much the same itch.
If you want a non ageing film that is light on the action thing then go with The Age of Adaline, or going more fitting with the "we like old films" thing that seems to be a thing in this thread then Brigadoon if you can stand musicals.
Short version. Not the worst thing I have seen but script could have been far tighter, action should have been far better, concepts could have been explored more and many plot holes. Apparently based on a comic so I am slightly curious as to what goes here.