Will prefinished Maple flooring yellow with age?
Yes, it will discolor over time. 

I have prefinished maple flooring in my living room with an area rug on it. I also have one window that is single pane without low-e. The sun has shined in (direct light over about 12 years) and discolored the floor around the area rug. Now, I can’t move the rug or it will show the “discoloration”.

I’d be careful if there is direct sunlight.