It is inspiring. It transcends age and physical beauty . In the funky cult movie from the 70 s Harold and Maude, Ruth Gordon plays a woman that exudes this infectious passion for living. Despite being in her early 70 s, she takes an alienated, nihilistic 20 year-old young man under her wing. She is zany and eccentric and he is beguiled.
Passion is essentially a spiritual quality.
It has to do with our soul. And our soul never ages, it only grows. Our bodies age, so it gets harder and harder to stay really sexy. Younger people have better physical tools. But we can experience more and more profound intimacy , more profound passion, as we age.