INDIANAPOLIS - For Dara Torres, it was always the same. No matter how many Olympic medals she won or how many times she touched the wall first, her stomach would rumble and churn before every race.

Torres figured she had left that all behind when she climbed onto the podium in Sydney to receive one more gold medal — the perfect capper to one of the most enduring careers in U.S. swimming history.

“Ahhh, it’s so nice that I don’t have to feel this nervous again in my life,” she thought to herself that day, almost seven years ago.

Well, think again.

At age 40, and just 15 months after having a child, Torres is back in the water hoping to earn her fifth trip to the Olympics. She’s competing this week at the U.S. National Championships, with every intention of reclaiming a spot on the American team next summer.

Torres already looks like a serious contender, winning the 100-meter freestyle Wednesday night against a field that included two other former Olympians.

“Don’t put an age on your dreams,” said Torres, whose 14th national title came a quarter-century after her first, back in 1982 as a 14-year-old swimmer.

Torres woke up Wednesday at 6:15 a.m., feeling those same ol’ pangs in the pit of her stomach even though she was still nearly five hours away from her preliminary heat.

“I couldn’t believe it,” she said. “I wake up this morning going, ’Well, here I am again. I feel like I’m going to throw up.’ People are like, ’You’ve done this so many times, how can you get nervous?’ But I think I’m more nervous now than I was during my last Olympics.”

Maybe that’s only natural when she looks at those swimming around her, many of them not even half her age, plenty of them young enough to be her daughter.

“She’s absolutely amazing,” said 16-year-old Caitlin Leverenz, who was honored just to warm up in the same lane as Torres. “I watched her push off from the wall and her streamline is one of the fastest in the world — and she’s like 40 years old. I’m thinking, ’Wait, this is an old lady.’ I’m just kidding. This is a swimming legend.”

No argument there.

Aj Mast / AP Dara Torres waves to the crowd after receiving her medal for winning the women's 100-meter freestyle at the U.S. National Championships on Wednesday.

Torres was the first American to swim in four Olympics and her trophy case is packed with nine medals: four gold, one silver and four bronze. She’s already pulled off one improbable comeback, stepping out of retirement to claim five medals in Sydney. At 33, she became the oldest U.S. swimmer ever to win Olympic gold.

After her amazing performance Down Under, Torres retired again. But she never lost her love of the water or got away from the training that made her a world-class athlete. In fact, on the day she delivered daughter Tessa, she had been to the pool and lifted weights.

“I was feeling miserable that day,” Torres recalled. “So I went in for a swim and felt so much better.”