The average age of people testing positive for coronavirus has fallen to 29 in a sign vaccines are working.
Over 30s are now eligible to get a jab, with all adults expected to be offered their first dose by the end of July.
In contrast, the median age was 35 at the beginning of April and 41 and the start of the year.
Figures also suggest hospital patients are becoming younger overall.
Last week, people aged under 65 made up 69 per cent of all hospital admissions across England according to the data.
In the same week last year, during the first wave, 64 per cent of coronavirus hospital patients were aged over 65.
Figures from Public Health England analysed by The Times show that over 85s remain most likely to be admitted to hospital with Covid-19.
The age group has the highest admission rate of 3.79 per 100,000 people.
Prime Minister Boris Johnson has urged patience while more data is collected over the next few weeks to ensure hospital admissions and deaths are not rising.
However he has said there is nothing in the current data to prevent the lifting of all coronavirus restrictions by June 21.
Some scientists are concerned about the emergence of the Indian Covid variant after cases doubled in a week.
Professor Andrew Hayward, a member of the New and Emerging Respiratory Virus Threats Advisory Group, said: "It only takes five or six doublings for that to get up to say a quarter million cases".
The latest data also shows a small increase in the total number of hospital admissions.
In the week ending May 23, admissions rose to 0.79 per 100,000 compared with 0.75 per 100,000 in the previous week.
Those with the highest infection rate were aged 10 to 19, at 55.2 cases per 100,000.
People with the lowest infection rate were aged 70 to 79, at 4.1 per 100,000.
Rates were highest in the north west and lowest in the south west.