The labour laws don't state a specific retirement age and it is the decision that a company can make on its own, but preferably held constant for all employees.
However, you need to check the Standing Orders of the state to ensure that you are following the same (or a certified standing orders if applicable). If Standing Orders apply, then the retirement age has to be the one stated in the Standing Order
From India, Mumbai
2358However, you need to check the Standing Orders of the state to ensure that you are following the same (or a certified standing orders if applicable). If Standing Orders apply, then the retirement age has to be the one stated in the Standing Order
From India, Mumbai
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Extension of retirement age of teachers in Maharashtra 25.2.2011.pdf
Retirement Age Calculator 58 years.xls