My parents received permanent resident status about one and a half years ago. They didn't take me to the interview because at the time of approval, I was over 21. We later learned that I could have gotten through. I wanted to know if, after so long, I can still file for an adjustment of status. I am currently in the US on an H1-B visa. I filed the form once a few months ago, but it was returned because I didn't have the approval letter. I don't want to spend an extra $400 to request the letter if this avenue is no longer a possibility. Is it too late to go through with this?