Just at the halfway mark of Deepak Chopra's Energize Your Life - Secrets for a Youthful Spirit, 21 Day Meditation Experience:
“There is a fountain of youth; it is your mind, your talents, the creativity you bring to your life and the lives of people you love. When you learn to tap this source, you will truly have defeated age.” — Sophia Loren
This quote was posted in the journal section of the day 11' session. In looking for notions and theories in line with this concept of youthfulness being independent of age, I came across a passage from the from The Four Agreements:
“Just imagine becoming the way you used to be as a very young child, before you understood the meaning of any word, before opinions took over your mind. The real you is loving, joyful, and free. The real you is just like a flower, just like the wind, just like the ocean, just like the sun.” - Don Miguel Ruiz
This book was nothing short of amazing, I highly recommend... and the mediation experience is always enlightening.
Becoming the way you used to be - young and free - the real you is loving and joyful - & age is merely but a number.
Signed a 36 year young... forever youthful enthusiast.