No such thing as too old to quilt!
as for using your stash, I tend to look for patterns first, keeping in mind my stash fabric and quantities. Once I have matched up piles of fabric to a pattern, THEN I start cutting. The trick is going through patterns/pictures of quilts and finding the pattern that suit your fabric and quilting skills.
If if you are looking for some simple designs, think about a 3 or 5 rail fence pattern---you can make it work with almost all fabrics. Another is a simple square in a square pattern if you have lots of small cuts and FQs.