Hi OpentoLearn,
Voluntary National Insurance contributions are not payable from the tax year in which you reach State Pension Age. It would not be worthwhile to continue to pay as they would not improve your pension entitlement.
If you would like to check your pension entitlement please visit:
Contact the Future Pension Centre or call them on 0800 7310175 (if in the UK) or +44 191 2183600 (if overseas).
Thank you.