Colonel, There is an upper age limit for UPPSC PCS. It is capped at 40 years. You will be 42 years by the year 2026. But by the virtue of serving the Nation and being an ex serviceman, you get an age relaxation of 10 years. So if you retire in 2026 at the age of 42, you still can appear for UPPSC. Now this is 2020 and we are talking about 2026. This eligibility criteria applies as long as the rules are not modified. If the rules and criteria change at any point in time then the eligibility criteria might change for you too. And there will be ex-serviceman quota for upto 1%.