Source document: https://docs-lawep.s3.us-east-2.amazonaws.com/1697802557064.pdf (India)
COMPULSORY RETIREMENT The appropriate authority has the absolute right to retire, if it is necessary to do so in public interest, any Government employee as per provisions of Rules as under:- FR 56 (j) 1 Category Group officers: ‘A & B’ iii.

Entered service before 35 years of age iv.

Attained 50 years of age Other cases: Attained 55 years of age 56 (e) a Govt.

Servant in Group ‘C’ of post who is not governed by any Pension Rules, can also be retired after he has completed 30 years service.
2 Notice Period 3 months or 3 months pay and allowances in lieu thereof Pension Rule 48 of CCS (Pension) Rules, 1972 servants All Government covered by CCS (Pension) Rules, 1972 who have years of completed 30 qualifying service.
3 months or 3 months pay and lieu thereof allowances in The cases of Government servant covered by FR 56(j) or Rule 48 of CCS (Pension) Rules, 1972 should be reviewed six months before he attains the age of 50/55 years or completes 30 years service, whichever occurs earlier in cases covered by FR 56(j) and 30 years of qualifying service under Rule 48 of CCS(Pension) Rules, 1972.

Time Schedule for review is as under:- Sl.

No.

Quarter in which review is to be made 1.

2.

3.

4.
January to March April to June July to September October to December Cases of employee who will be attaining the age of 50/55 years or will be completing 30 years of service or 30 years of service qualifying for pension, as the case may be, in the quarter indicated below to be reviewed July to September of the same year October to December of the same year January to March of the next year April to June of the next year A register of employees who are due to attain the age of 50/55 years or complete 30 years of service to be maintained.
The register should be scrutinized at the beginning of every quarter by a senior officer in the Ministry / Department and the review undertaken according to the above schedule.

Note : Compulsory Retirement as a penalty under CCS (CCA) Rules, 1965 is distinct from the above provisions.

All India Service: A Member of All India Services can be compulsorily retired in terms of Rule 16(3) of AIS (DCRG) Rules, 1958.
On completion of fifteen years or twenty five years of qualifying service or attains the age of fifty years on any date thereafter.

Detailed procedure is indicated in the annexed copy of DoPT letter No.25013/02/2005-AIS.II dated 28.6.2012