PIP entitlements for pensioners

Hello,
I am writing this on behalf of my mum who is 72 years old. She has worked all her life but had to retire early due to a physical disability. She has been told that she is not entitled to apply for PIP as she is over state pensions age and this is because her physical problem is deemed as ‘natural ageing ‘
This is not the case and I feel it is very unfair she cannot apply? Having seen the newsletter this month on assessments for pensioners on PIP I am wondering if she has been misinformed?

An advice greatly appreciated

Thanks

Tess