Taxable or not

one of my client, Received Pension Rs.36000/- per month& he is Regd. Govt employee. He is Physically Disabled person.

Pension income is taxable similar to salary and the assessee can claim deduction under section 80 U upto Rs.75,000 who suffers from not less than 40 per cent of any disability  (Rs.1,25,000 to a person with severe disability). 

he is Senior Citizen. up to Rs.500000/- he is not liable to TAX?

In that case, he is not liable to tax...!!! 

senior or super senior?? whats his age?

senior. 66years