67-year-olds can make appointments for the Covid-19 vaccination from today.
Bookings can be made online HSE.ie and by calling the special HSE phone line on 1850-24-1850.
Over 35,000 people have registered for a Covid-19 vaccination after the online portal since it went live on Thursday.
People aged 66 can book from Sunday 18th April and people aged 65 from Monday 19th April.
A PPS number, Eircode, mobile phone number and an email address is required to register online.
The vaccinations will start from next week and will be administered at vaccination centres rather than at GP surgeries.
Speaking at the weekly Covid-19 briefing, Chief Executive Paul Reid said people aged 60 to 64 will be invited to register for vaccines "well before the end of April."
People in the very high risk group 4250,000, 16-59 year olds, will be vaccinated via a combination of vaccination centres, community vaccination teams and GPs.
Mr Reid also told the briefing that the vaccination target for next week now stands at between 140,000 and 160,000 doses.
The target for the week had stood at 180,000 doses, however the target had to be revised, following the change in advice surrounding the administering of the AstraZeneca vaccine.
The HSE said that it would take three weeks to administer first dose vaccines to 65 to 69-year-olds and a further three weeks for the 60 to 64-year-olds, but that they will all be done by the end of May.