Dear Prachi,
You are allowed to hire any senior citizen (above 58 yrs), it can be hire two ways (on payroll / off payroll.)
1) On payroll :- if you wish to hire such person on payroll, then you can hire as normal employee with all social security benefits (pf,ESIC, bonus, grauity etc.) but, no need to pay pension contribution, same amount you can putted in PF account.
2) Off roll :- to avoid any liability toward the social secuirty benefits, you may take him on contract by making service contract & can be paid his fees by ask him to raise the invoice / bill on monthly basis.