Hi Wolf1
Review forms can be sent out up to a year before the award end date. Technically, he could receive a review form at any time from April 2028.
The State Pension Age is currently 66 but will increase over the next two years to 67. As your partner was born in 1965 he won't reach SPA until 2032, and therefore as it stands at the moment, he is likely to receive the standard review form and have an assessment which could be, telephone, video, face-to-face or paper-based.
BIS
Nothing on this board constitutes legal advice - always consult a professional about specific problems