Stephen Hilger—Bloomberg / Getty Images
March 20, 2015 10:30 AM EDT

The world’s oldest people have all kinds of advice for living longer. Their secrets range from staying away from men and believing in the Lord to smoking cigars and eating a ton of pork.

But for Elizabeth Sullivan, a Texas woman who just turned 104, the secret to longevity is Dr Pepper. She’s been drinking three cans a day for about 40 years, she told Forth Worth’s CBS affiliate.

“Every doctor that sees me says they’ll kill you, but they die and I don’t,” she says. “So there must be a mistake somewhere.”

For her 104th birthday, Sullivan got a gift basket from Larry Young, the CEO of Dr Pepper Snapple Group. She also got a cake shaped like a can of Dr Pepper, because obviously.

Read next: Calorie Count Coming Soon to a Can of Guinness Near You

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