People aged 44 will be invited for their first Covid-19 jab from today (Monday).
Around half a million people will receive a text inviting them to get their jab through the national booking service.
NHS bosses say more than two thirds of people aged 45 to 49 had been vaccinated so far.
More than 28 million people have received their first dose of the vaccine since the national roll out in December.
People who fall into the new age category are being urged to take up the vaccine offer.
NHS England chief executive, Sir Simon Stevens said: “Thanks to NHS staff, people aged 45-49 have been hot on the heels of millions of people most at risk who were quick to take up the offer of a vaccine with more than two thirds getting their lifesaving jab, marking another medically important milestone in the biggest vaccination campaign in NHS history.
"When the time comes, and you get that text, book an appointment to get your vaccine – it is the best protection you and your loved ones will receive from this deadly virus.”
NHS Medical Director, Professor Stephen Powis, added: “It is testament to the hard work of NHS staff that we are now able to vaccinate people in the next age group.
“If you are aged 44, when you are invited to do so, please do book your jab as appointments become available – it is simple, effective and provides vital protection against the coronavirus.”
