For CRPF ASI posts the general age limit is usually 18 to 25 years, though it varies by the specific ASI post — stenographer and ministerial posts can have different limits. OBC candidates get 3 years of relaxation and SC/ST candidates get 5 years, as per government rules. Age is counted on the cut-off date mentioned in the notification. Always confirm from the official CRPF advertisement for the current year.