WASHINGTON (AP) — Elizabeth Warren “is in excellent health,” according to a doctor’s report released by the Massachusetts senator on Friday, becoming the first in a trio of top Democratic presidential candidates over 70 to make their medical records public.

Warren’s last physical was in January and was conducted by Dr. Beverly Woo, who said she has served as the candidate’s primary care physician since 1999. Woo, from Boston, wrote in a one-page letter dated this week that Warren’s “only medical condition” is an underactive thyroid gland, which is easily treated by medication, the only kind she takes.

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The senator , 70, is up to date on some important protective health steps: She had her annual flu shot in October, and a routine mammogram in January found no sign of trouble. At 5 feet, 8 inches, she weighs 129 pounds, exercises regularly and follows a healthy diet, the doctor wrote. She has never smoked, misused drugs or had a problem with alcohol.

Woo said Warren’s January checkup found no red flags. In fact, her blood pressure was lower than is usual for someone her age — 115 over 57 — and her heart rate was 70, levels that are seen in people who exercise regularly.

“If I were seeing a 70-year-old woman in my clinic with these vital signs, physical exam and lab values, I would tell her that she is quite healthy for her age,” said Dr. Brian Antono, a family medicine specialist at Georgetown University School of Medicine who reviewed the health information released by Warren’s campaign.

Warren underwent a long list of blood tests at that physical, and none signaled any underlying diseases. Importantly, they indicate she’s at low risk of heart disease and stroke. Her blood sugar was normal. Her cholesterol was in the healthy zone, with a total cholesterol of 193 and level of the so-called “bad” subtype, or LDL, at 88. Her level of HDL, or “good” cholesterol, was an unusually high 95. In contrast to the other cholesterol types where a lower number is better, an HDL higher than 60 is considered protective — and Antono said the thyroid condition Warren has sometimes bumps up that number.

“Her normal cholesterol levels combined with the rest of her ‘puzzle pieces’ – normal blood pressure, normal blood sugar and non-smoker status – are all positive contributors to an overall reassuring heart health,” Antono said.

The senator frequently jogs onto stage at her rallies and says she keeps healthy by walking frequently while talking on the phone or listening to audiobooks, with the goal of doing 7 miles (11 kilometers) daily. “But I don’t always hit it,” she says.

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Warren is among her party’s primary front-runners along with Vermont Sen. Bernie Sanders, 78, and former Vice President Joe Biden, 77. Also in the top tier is Mayor Pete Buttigieg of South Bend, Indiana, who is 37.

Sanders had a heart attack while campaigning in Las Vegas on Oct. 1 and has brushed off complaints his campaign wasn’t fully forthcoming about the extent of his health scare until he was subsequently released from the hospital. But he has promised to release full medical records by the end of the year. Biden says he’ll make his health records public before the Iowa caucuses on Feb. 3.

A Pew Research Center poll from May found that about half of Democrats said it would be best for a president to be in their 50s. Another quarter said it would be best for a president to be in their 40s, and 16% preferred a president in their 60s. Just 3% said someone in their 70s would be best — and 6% said the same of a president in their 30s.

Donald Trump, now 73, became the oldest newly inaugurated first-term president in January 2017. He has been criticized for releasing only cursory details on his health while running for the White House.

His doctor, Harold Bornstein, wrote in December 2015 that Trump would “unequivocally” be the healthiest president in history and deemed the celebrity businessman’s condition “astonishingly excellent.” Bornstein later said he wrote the note in five minutes while a limo sent by the candidate waited outside his office.

Last month, on a Saturday, Trump visited Walter Reed National Military Medical Center, a stop that wasn’t listed on the president’s schedule and came just nine months after his last physical. Trump later said he went through a “very routine physical” and blamed the media for sparking unfounded fears that the visit meant he was ill.

Figuring out how fit the septuagenarians — or any candidates — really are can be tricky. No law requires them to disclose their medical records, though doctor’s notes and the records from a most-recent physical, like Warren released, do provide snippets and important clues.

Biden had a brush with death in 1988, requiring surgery to repair two brain aneurysms — weak bulges in arteries, one of them leaking. Medical records released in 2008 during Biden’s vice presidential campaign showed he’d made a full recovery, with no trouble since.

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Associated Press writer Hannah Fingerhut contributed to this report.