A reaper is going to take an old man life,but the old man want to finish his life checklist before the reaper get him.

This logline falls in line with your others, therefore, I suggest you read the comments made on your other posts and apply them to this one.

One point to consider here is the lack of clarity about the protagonist - the Grim Reaper or the old man? Once you decide who the main character is, like with the other loglines, give him a reason to need to achieve a specific goal.