They won't let you transfer 4 embryo's at a time Luv. Usually 2 embryo's or 3 (which I was allowed to do at my Clinic and only under very strict criteria/conditions that had to be met ) are allowed. The reason being is that they want to decrease the chances of multiples. However, the chance of a multiple pregnancy using your OE's (own eggs) at your age and older are pretty bloody slim.
I'd be pushing for 2 embryo's to be transferred..called a Double Embryo Transfer...DET.