Hi Skydancingangel
When a PIP claimant reaches State Pension Age - PIP continues; however, it is not possible to increase a mobility award from standard to enhanced.
If you reported a change of circumstances prior to reaching state pension age, and if after your review they say - they can't increase your mobility (because of your age) - you should argue that you put in for a change of circumstances some time ago, and so the decision and money should be backdated to point you informed them.
After SPA your daily care can be increased.
BIS
Nothing on this board constitutes legal advice - always consult a professional about specific problems