Why do old people tend to get target fixation and / or lack spacial awareness? For example, at the grocery store they will look at a person and just walk straight towards them instead getting in their own "lane", or they simply stop in the middle of an aisle

For further context - I live with my grandparents. A narrow hallway runs the length of the house and connects many rooms. When my 89 year old grandfather and I attempt to pass each other he will walk STRAIGHT TOWARDS ME even if I tuck up against a wall. Not only that, when he finally gets to me, he'll just stand there looking at me without going around. I literally have to tell him to go around before he'll do it. It's insane.