The Old Guard.
Nicely done Netflix adaption, no wasted moments to it, although a couple of elements have that slightly comic book style forced aspect to it.
Charlize Theron smoothly plays the part Andy, the leader of a small band of immortals who act as covert mercenaries who has "forgotten more ways to kill than most entire armies learn" and has been around so long she can't remember when she was born, or what her mother or sisters looked like. Of course, modern day arrives, and shenanigans ensue when someone unearths their secret and wants to hunt them down to disect and use as cures for the human condition. To help tell the story to the audience, you also get the introduction of the first "new immortal" in a couple of centuries, so a lot of it is answering her questions on what the hell is happening to her. All set up with an ending that screams "this is potential franchise" for Netflix to run several more films following it.
I think the one major misstep to it is it has a very forgettable soundtrack for the most part, so that slice of emotional punch is missing. And I suppose it can depend on just how many stories of weary immortals struggling to deal with always losing friends and families who age and die while they carry on you can take....