I bought my computer in June of 2008 and today I noticed on my keyboard the letter “N” is more than half way worn off. All the other keys on the keyboard are still visable.
I guess I must type the letter “N” so much that I’ve worn the paint (or sticker or whatever it is) off the key “N.”
So look at your keyboard now. Do you have any letters that have disappeared off your keyboard. If so how old is your keyboard?