You have mentioned that only deductions will be Provident Fund and Income Tax as per the case. I think you had earlier stated that PF is not applicable. This depends on the willingness of the management. Instead of EPF, the retired incumbent, by whatever designation called, may be allowed PF benefit for crediting the PF amount recovered from the employee along with the employer's contribution in PUBLIC PROVIDENT FUND (PPF) with banks or post offices.
Of course, he may not be eligible for the benefits of EPF and ESI. Instead, he can be given free mediclaim policies or medical reimbursements both during service and thereafter, as a good employer would generally like his present and ex-employees to have a peaceful life.
If he is not paid properly, it amounts to exploitation of seniors. In fact, senior citizens will contribute more than many other persons, though not all. They will deliver results with good and valuable suggestions/advice. Private firms owned by Jains and Chettiar communities prefer mostly senior people for their continued service, knowledge, experience, and honesty. CTC in respect of senior citizens should also be calculated, and they should be placed on par with other employees, of course, based on their ability, devotion, duty, etc., without considering age, which is only a number.
Regards