State pension age is 66 years, eligibility for free travel / NHS prescriptions do not coincide with state pension age , eligibility is 6 years in advance of state pension age
I’d accept there’s an argument for raising it to match state pension age, especially if there’s evidence it’s costing a significant amount due to older commuters benefiting from it.
As with a lot of benefits for older age groups (eg non means tested winter fuel allowance) it will be politically very difficult to challenge given the demographics of the U.K. population.