Good suggestion by Mr. Simhan and Mr. Saikumar.
Kishan, as you mentioned that you have formulated the policies with the full support of your management or that your management is ready to apply these norms, I don't think you need to reconsider this issue. Before applying these changes in your organization, you do not need approval from any employee, whether they are old or new.
One must not question the efficiency of management or the people who are part of it. Making or formulating policies for the organization is part of the management's official work. If these employees do not agree with these changes, they are directly opposing management.
If I'm not mistaken, you have changed your office timing to 9:00 AM to 5:00 PM/6:00 PM from the old timing of 10:00 AM to 6:00 PM/7:00 PM. Change in morning time, right? I hope you are not enforcing unconditional timing on them or disobeying the rules laid down in the section of employee/worker timing under the Act, because it seems you forgot to mention the change you made in office timing.
I understand that these employees have been working for your organization for a long time and have certainly contributed much to your company, but they must not forget that they are just employees, not part of management. They must respect and accept the decision of management because they know their management better, being very old employees.
I agree with Mr. Simhan that one must take care of employee benefits while making policies, but I don't think that management would take any step in this regard without considering the effect or impact of these changes on their employees and organization. Certainly, these things would have been considered and discussed with all heads of departments and directly concerned parties before applying these changes.
Not every single employee can be consulted before making these changes, whether they are old or new employees.
Second, management is not there for a few employees but for all, and they have their own style and have to run accordingly. If management has granted you permission to implement these changes or formulate the policies, you can go ahead and inform all employees by "Circular."
Third, I have never seen in my career that an employee has left the job just because they were not comfortable with office timing if they were never forced to work unconditionally.
Regards,