Duration of PIP award

Hello,

I just got a call today telling me I was awarded PIP (higher rate for both components). This is my first time claiming. I did not have a full assessment, they just gave me an unscheduled call one afternoon that lasted 15 minutes and confirmed some things, then less than a week later I got the call telling me I've got it.

While this is great news, they told me the award was only for 2 years (January 2025 to 2027). I am a bit surprised by this as I have Cerebral Palsy which is lifelong and not expected to change much as an adult (if anything, things could get worse). I'm also not recovering from any recent surgeries or procedures that may imply my condition will soon get better. Does anyone know what the potential reasons for this duration award is? I am not a British citizen and currently have definite leave to remain (due to switch to indefinite this November) so I am wondering if it may have something to do with that? Or maybe with the changes to the eligibility criteria that have been announced for 2026?