Sue
In principle, he can ask for his claim to be looked at but he will need to show categorically, with the support of evidence dating from when he was 65, that he met the criteria for a Mobility award when he was 65. The DWP will certainly ask why, if he met the criteria so clearly then, why was a review was not requested seven years ago?
I'll be honest and say that the chances of an award being made so long after he reached 65 is pretty much zero.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems