On attaining the specific and prescribed age, a person will get retired autormatically. For example 58 or 60 years depending upon the State and Central Government. The administrative staff in the state government will be 58 and 60 will be for the Central Government. For academic community, it is 60 / 62 years.
It depends the employee concerned within the frame work of the rules. On attaining the 20 years of service, person can apply for volunatry retirement. Some time, the organisation itself can give VRS with the certain benefits. If a person from Central Govt. resigns after completing 20 years of service, he will be given additional weightage of 05 years for getting the terminal benefits.
Some time, the governmnet it self, on public interest, give VRS to the employee.
In case you want more details, i will provide.
senthil raj 4th September 2006 From Costa Rica, San Josť