Surfin' Safari: Meet the 90-Year-Old Daredevil Water Skier

She said she started when she was 34.

One 90-year-old woman is proving that age is just a number as she was filmed water skiing in an Oklahoma lake.

Read: Those Lazy-Hazy-Crazy Days of Summer: The 10 Oddest Beaches in America

Millie Sullens turned heads as she glided on the surface of Lake Tenkiller on Tuesday.

Sullens was invited come to the lake by marina owner Kevin Dudley after he saw video of her water skiing.

"It's such a remarkable feat to be 90-years-old and doing this. I don't know very many people in the world that could accomplish that," he told KFSM-TV.

Dudley took control of the boat as Sullens went for a ride on her skis. She waved to people around, even giving a thumbs up. 

Read: 6-Month-Old Girl Becomes World's Youngest Water Skier

She learned how to ski when she was 34 from her husband, who has since passed.

She now teaches her great-grandchildren how to water ski.

“It's like you got the whole world by yourself and when you get a new skier you live that same thing,” she told KFSM-TV. “I just have fun teaching everybody and following them across the waters.”

Watch: Don't Forget the Sunscreen! Here Are America's 10 Best Beaches