Hi Astrolady
Welcome to the forum, you might want to have a look at the following FAQ which explains where everything is.
Welcome to Benefits and Work .
If you receive PIP before State Pension age you will go on to receive it once you are over this age.
The relevant age is 65 or State Retirement Age, whichever is the higher.
You cannot be awarded the Mobility as a new or an increased award after you reach the relevant age with the exception of the initial transfer from DLA to PIP where the age restriction is suspended.
If you have a Mobility award before the relevant age then you can continue to receive it after as long as you continue to meet the criteria.
If you have any further questions please come back to the forum.
Gary