I have at least a dozen tops waiting to be quilting...one or two of them date to the late 70's...and others to the 80's. But since I got my Juki 98Q, I do quilt a lot of the tops I make. Partially, because a lot of them have been baby quilts and had to be finished.
I also think that because I am getting older, I want things finished. I am 58 and have enough fabric to last my lifetime! This last time I did fold the top I had just finished and put it away...I then went back and picked up a top made around 2007-8 and sandwiched it and got it quilted.