Misplacing Things: Frequently losing items and being unable to retrace steps to find them.

Disorientation: Losing track of dates, seasons, and the passage of time. Individuals may also become lost in familiar places.

They're not trying to frustrate you. Their compass, the part of their brain that tells them where they are and who they're wit is broken. 

and so much more.. you will get the fundementals of dementia