Mine is still new, I just got mine two days ago actually. I asked because I saw a bit of shine on my sisters MacBook Air keyboard. So, I was curious if it's her fingers that had oils or is it in general that happens to all macbook pro/air users.
I have had my macbook air since September 19.
I usually have clean hands and don't really eat near it (I will admit I do it once a month or so).
I wipe the KB down once a week with a lysol wipe and they are not shiny at all.
Although, my fingers may not have much natural oil?