Hi,

There is no such number of attempts specified.

There is an age limit specified and its upto you how many attempts you want to give.

For general category it's generally 21 to 27 years, roughly 7 attempts. For reservation  you get age relaxation and hence more than 7 attempts.

There is no restriction on the number of attempts. But you should check eligibility criteria before to appear.

There are different age criteria for different posts. But for most of the post, the minimum age should not be less than 18 years. The upper age limit is different for a different post. It varies from 25 to 32.

Hope this helps.
All the best.