How do you stay young?

A friend shared this with me few days ago and I’d like to share with you too:
The first day of school our professor introduced himself and challenged us to get to know someone we didn’t already know. I stood up to look around when a gentle hand touched my shoulder. I turned around to find a wrinkled, little old lady beaming up at me with a smile that lit up her entire being, she said, “Hi, handsome. My name is Rose. I’m eighty-seven years old. Can I give you a hug?” I laughed and enthusiastically responded, “Of course you may!” and she gave me a giant squeeze. “Why are you in college at such a young, innocent age?” I asked.