I got my green card back in 2003, I traveled to the U.S. in search of a better life. Since my grandmother was sick I had to comeback to my home country in 2008. I've been out of the U.S. for more than a year. My grandmother is fine now and I'd like to comeback to the U.S. My green card expires in 2014, so it's still valid now. Will I be allowed to comeback to the U.S.?
Generally speaking, a visit outside USA lasting more than one year terminates your green card (no matter what the card says).