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This 102-year-old shares her secrets to aging with grace: 3,800 steps, an adult tricycle, and a lot of laughter

When Dr. Gladys McGarey was 93, she awoke from a vivid dream one Sunday morning.

She was nine again, living in a tent in the jungle in India, where she grew up. She emerged from her tent in the early morning, looking mischievously to see if anyone was watching. When the coast was clear, she ran as fast as her legs allowed and climbed a mango tree. Once she got to the top, she sang. The song lyrics are hazy, but McGarey knew she was belting something fun.

“I'm singing any old thing that I want to sing, and having a great time,” McGarey, who is now 102, tells Fortune. She recalls doing something out of the ordinary—because Sundays growing up consisted of specific hymns and rituals with her family. But she kept singing her own favorites.

“I was singing, and I was laughing at the same time as I woke up,” McGarey says.

Called the mother of holistic medicine, McGarey co-founded the American Board of Holistic Medicine and ran a medical practice for over 60 years. She's also authored a handful of books on the science of healing and preventative medicine and continues to work today as a consulting doctor seeing patients about once a week.

Despite her career success, she didn’t feel like she could always express herself.

“I didn't really find my voice until I was 93,” she says, recalling how she struggled to write in elementary school and was called the “class dummy,” due to her dyslexia.

But her dream reminded her it’s never too late to shout from the tree tops—or in her case, write her wisdom from the heart.

At age 100, she began writing her forthcoming book, The Well-Lived Life. In it, McGarey explores how to find and cultivate purpose, and shares six secrets to health and happiness.

Here are a few words of wisdom from her well-lived life:

Find purpose 

As an active centenarian, McGarey often fields questions about the secret to her longevity. Her son jokes about how his mother has a ten-year plan to this day. McGarey says her passion for learning and staying engaged with the world around her is thanks to her sense of purpose.

Conventionally defined as an intention, a purpose is the reason behind our actions. If something propels us forward, we find more meaning in what we do—whether a career, a set of values, a passion project, meaningful connections, or a way of life.

“It’s that kind of finding out what it is that you can do and what your soul is telling you,” she says. “You have got to do it.”

Fortunately, it doesn’t need to take years to find your purpose, and it’s not merely a goal to check off the to-do list. It can lie in everyday activities that make you feel present or the small moments of joy we find outside work when we slow down. The connections in our life or a side-hustle can bring us a sense of excitement. And the answer is closer than many would think. It’s about trusting your gut when something feels right, McGarey says.