The agency has now launched a campaign calling for adults across the country to take the free Heart Age Test and reduce their risk of cardiovascular disease with lifestyle/behavioural changes if necessary. So far, the test was completed nearly 2 million times, said PHE, and the results were quite grim - four out of five people had negative results, showing an aged heart.
Four in five people have a heart age older than their real age, leaving them at risk of early death from cardiovascular disease, Public Health England data show.
It determines whether their "heart age" is higher than their actual age and gives an indication of how this affects their risk of having a heart attack.
Those who have a heart age higher than their actual age are at an increased risk of heart attack or stroke.
The test is not diagnostic - it will not tell you whether you are going to have a heart attack - but it can be a wake-up call to make healthy changes.
It comes as a study found that nearly four out of five adults are at risk of an early death because their "heart age" is higher than their actual age.
PHE has designed the test to provide those who take it with a "heart age", which can be increased by high cholesterol and high blood pressure.
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He added that heart attack was the most common cause of heart-related CI claims in 2017, while heart-related CI claims also include coronary artery bypass graft, cardiomyopathy, heart valve replacement, aorta graft surgery, open heart surgery, angioplasty and cardiac arrest.
Dr Matt Kearney, national clinical director for cardiovascular disease prevention, at NHS England, said the test could potentially help millions of people.
People can improve their heart health by losing weight, quitting smoking, exercising regularly and cutting back on alcohol.
Around 24,000 deaths a year from the condition occur in those under 75 and four in five cases are preventable - equivalent to around 50 deaths daily.
The Heart Age Test has been completed more than 1.9 million times across England. By taking simple steps to adjust behaviour and lifestyle patterns people can significantly reduce their risk of a stroke or heart attack.
As well as obesity, poor diet and a lack of exercise, high blood pressure is a significant risk factor for cardiovascular disease, but these are all things that people can change, and they can change them now. If so, he recommended to "make an appointment to see your GP".
Public Health England's Heart Age campaign will run until 30 September. Adults are encouraged to search "heart age" to take the free online test.