Retired, in receipt of a partial UK state pension, can one apply to buy back extra years now?

I have tried to google the answer but can't find one.

If someone is already retired and in receipt of a partial UK state pension, can they apply to buy back extra years now or is it too late? I assume the answer is the latter just wanted to double check so that they don't miss out.

Born in 1952 if that makes a difference?

Contact DWP - they will advise if worth doing.

They might allow you to backpay at the cheaper Class 2 for those years in which you were in insured (PRSI) employment and pay more expensive Class 3 for those other years including retirement year. For accurate information contact DWP and HMRC.

It seems you can, but only for years before you reached retirement age. Have a look at the answers on this page:
https://community.hmrc.gov.uk/customerforums/ni/4ae46063-6408-ef11-a81c-002248004cca,
in particular this question:

I live abroad in the EU. I am already collecting my state pension. I am 66 years old. However, the pension I receive reflects the fact that I am one year short of the full state pension. I have two NI contribution gap years 2019-2020 and 2022-2023. Both of these are at the same amount of contribution. Is it still possible for me to pay for one of these years and if so how do I obtain a payment number to make the contribution? Thanks in advance.

Hi tonyz
You can make voluntary payments if you are already in receipt of your state pension, however, can only pay for tax years prior to your state pension age.
If you are residing abroad you need to contact the International pension centre +44 (0) 191 218 7777 who will issue a letter advising what gaps you have, what you can pay, how much it will be and how to pay.
Thank you.

Thanks will see if they qualify.