That is a very worthy goal! This book isn't about feeling young but about being in the present moment. I really recommend it. It's Peace is Every Step by Thich Nhat Hanh. It talks about noticing the beauty all around you, and in your body, in every breath. He's a great teacher. Give it a try! It might move you along the path to feeling younger. I'm 67 and feel very, very young and alive and happy to be alive and experience new things. Also, btw, your name sounds old. "Tired Feminist." Perhaps you should change it to something more youthful? Language not only reflects but also shapes reality.