Technically one could have an old universe and a young earth. I myself, in regards to the "age-issue" can only give an honest answer, I CHOOSE to accept the young view by faith. I can't know - of course I can't! Nobody can fully know what happened in the past when it comes to such things. IMHO.
Why can't we use the characteristics and chemical make-up of the rock to determine its age? Why do you rely on faith when you can follow the evidence?