I've been thinking about that. I'm not as old as she is but if I get into her habit in the near future I would probably have an accumulation like that in another ten years. For now I try to finish whatever I start -- sometimes it takes quite a while but I feel a guilty if I don't finish something. There's a tug of war going on with my Midwestern values and the [not entirely] nascent self-indulgence that not finishing quilt tops would represent to me.
I feel something like sinfulness [waste not, want not?] if I don't finish something I've started. That used to be true of books. I literally felt guilty about 20 years for not finishing Pollyanna Grows Up when I was ten or so. Finally I realized that it reflected a basic good sense and good taste and started being proud of not finishing it. Still, I rarely start a book and not finish -- only if I find the author very, very dull or his story, fiction or nonfiction, untrue or too superficial to waste my time reading.
I will keep on thinking about going from one finished quilt top to another -- at the moment I have four tops in the process of being made. I know I will finish two of them and think I'm likely to finish all four. Often, I've found, another person's example is the PING that rings through out old habits and taken-for-granted truisms to makes us realize our set ways of doing things just might not be any better than doing the exact opposite. At the least that's a good reason not to become a hermit and to be a bit introspective about things that catch our attention.