Dear Ms. Chandrika,
It is the duty of the employer to verify the minimum essential qualifications of age, education, experience, etc., of a prospective candidate at the recruitment stage itself before his appointment. Well, inadvertence somewhere in the process caused this blunder, but you noticed it later and set it right by terminating him. Since there is no mention about the type of your establishment or the nature of the individual's job or the suppression of the fact of actual age is attributable on the part of the candidate, no comments about the legality of the appointment. Anyway, it may be a violation of the rules of recruitment of the company, and if not corrected, the appointing authority would be in trouble and hence the termination after 4 days of work, okay? As a boy of 17 years of age, he is an adolescent and as such eligible for industrial employment if not specifically barred by any special law applicable to your establishment. Illegal appointment, though cannot be continued, would not result in deprivation of wages for the period of service rendered. So, pay the wages for the 4 days of work as permitted by your A/C norms as suggested by Mr. Kumar.
Kindly review the corrected version above.