I am 26. I started quilting when I was twenty. I think you would be surprised by the number of younger people who are quilting. My friend and I started a quilt guild for graduate students from my university. We have gotten a number of other students to start quilting.
I would check to see if there is a group in your area with younger people in it if your daughter is interested. Although I love to see what "older" quilters are doing, I am much more comfortable quilting with people closer to my age.
Happy quilting!