1. The clause of upper age limit in Government service is applicable in all Government service for all categories. Only the upper age limit is different for different category.
2. As far as I know, the upper age imit for Government service for all categories is more than 25 almost everywhere (except in the armed forces). For general category, it is 30 in most cases.
3. As Government service is pensionable service and an employee gets pension after rendering a fixed period of service, so an upper age limit for joining Govt. service is logical.
4. For the job-seekers also, if they cross the upper age limit but don't get Govt. service, they should not waste their valuable time in search of Govt. jobs, and instead opt for other professions.
Come as you are!