Mary Hart is 55 years old and has been hosting ET for an incredible 25 years as of this month. What's her secret for looking so young?

In an interview with USA Today she says that the more years she's put in on ET, the more time she spends on her treadmill and elliptical trainer. She also loves to spend time outdoors kayaking and cross-country skiing in the mountains of Montana.

ET does a lot of stories on plastic surgery. But Mary Hart says she's never had any done, though she's thought about it lots.

The interview doesn't pry into her possible reliance on the less invasive non-surgical procedures such as Botox or collagen but looking at her wrinkle-free 55 year old face, I'd think there must at least some of this type of regular treatment as part of her secret to looking so young.

Mary Hart is the queen of celebrity gawking television. Over seven million people tune in to watch her every night.